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godot/thirdparty/libtheora/analyze.c

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/********************************************************************
* *
* 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 http://www.xiph.org/ *
* *
********************************************************************
function: mode selection code
last mod: $Id$
********************************************************************/
#include <limits.h>
#include <string.h>
#include "encint.h"
#include "modedec.h"
typedef struct oc_fr_state oc_fr_state;
typedef struct oc_qii_state oc_qii_state;
typedef struct oc_enc_pipeline_state oc_enc_pipeline_state;
typedef struct oc_rd_metric oc_rd_metric;
typedef struct oc_mode_choice oc_mode_choice;
/*There are 8 possible schemes used to encode macro block modes.
Schemes 0-6 use a maximally-skewed Huffman code to code each of the modes.
The same set of Huffman codes is used for each of these 7 schemes, but the
mode assigned to each codeword varies.
Scheme 0 writes a custom mapping from codeword to MB mode to the bitstream,
while schemes 1-6 have a fixed mapping.
Scheme 7 just encodes each mode directly in 3 bits.*/
/*The mode orderings for the various mode coding schemes.
Scheme 0 uses a custom alphabet, which is not stored in this table.
This is the inverse of the equivalent table OC_MODE_ALPHABETS in the
decoder.*/
static const unsigned char OC_MODE_RANKS[7][OC_NMODES]={
/*Last MV dominates.*/
/*L P M N I G GM 4*/
{3,4,2,0,1,5,6,7},
/*L P N M I G GM 4*/
{2,4,3,0,1,5,6,7},
/*L M P N I G GM 4*/
{3,4,1,0,2,5,6,7},
/*L M N P I G GM 4*/
{2,4,1,0,3,5,6,7},
/*No MV dominates.*/
/*N L P M I G GM 4*/
{0,4,3,1,2,5,6,7},
/*N G L P M I GM 4*/
{0,5,4,2,3,1,6,7},
/*Default ordering.*/
/*N I M L P G GM 4*/
{0,1,2,3,4,5,6,7}
};
/*Initialize the mode scheme chooser.
This need only be called once per encoder.*/
void oc_mode_scheme_chooser_init(oc_mode_scheme_chooser *_chooser){
int si;
_chooser->mode_ranks[0]=_chooser->scheme0_ranks;
for(si=1;si<8;si++)_chooser->mode_ranks[si]=OC_MODE_RANKS[si-1];
}
/*Reset the mode scheme chooser.
This needs to be called once for each frame, including the first.*/
static void oc_mode_scheme_chooser_reset(oc_mode_scheme_chooser *_chooser){
int si;
memset(_chooser->mode_counts,0,OC_NMODES*sizeof(*_chooser->mode_counts));
/*Scheme 0 starts with 24 bits to store the mode list in.*/
_chooser->scheme_bits[0]=24;
memset(_chooser->scheme_bits+1,0,7*sizeof(*_chooser->scheme_bits));
for(si=0;si<8;si++){
/*Scheme 7 should always start first, and scheme 0 should always start
last.*/
_chooser->scheme_list[si]=7-si;
_chooser->scheme0_list[si]=_chooser->scheme0_ranks[si]=si;
}
}
/*This is the real purpose of this data structure: not actually selecting a
mode scheme, but estimating the cost of coding a given mode given all the
modes selected so far.
This is done via opportunity cost: the cost is defined as the number of bits
required to encode all the modes selected so far including the current one
using the best possible scheme, minus the number of bits required to encode
all the modes selected so far not including the current one using the best
possible scheme.
The computational expense of doing this probably makes it overkill.
Just be happy we take a greedy approach instead of trying to solve the
global mode-selection problem (which is NP-hard).
_mb_mode: The mode to determine the cost of.
Return: The number of bits required to code this mode.*/
static int oc_mode_scheme_chooser_cost(oc_mode_scheme_chooser *_chooser,
int _mb_mode){
int scheme0;
int scheme1;
int best_bits;
int mode_bits;
int si;
int scheme_bits;
scheme0=_chooser->scheme_list[0];
scheme1=_chooser->scheme_list[1];
best_bits=_chooser->scheme_bits[scheme0];
mode_bits=OC_MODE_BITS[scheme0+1>>3][_chooser->mode_ranks[scheme0][_mb_mode]];
/*Typical case: If the difference between the best scheme and the next best
is greater than 6 bits, then adding just one mode cannot change which
scheme we use.*/
if(_chooser->scheme_bits[scheme1]-best_bits>6)return mode_bits;
/*Otherwise, check to see if adding this mode selects a different scheme as
the best.*/
si=1;
best_bits+=mode_bits;
do{
/*For any scheme except 0, we can just use the bit cost of the mode's rank
in that scheme.*/
if(scheme1!=0){
scheme_bits=_chooser->scheme_bits[scheme1]+
OC_MODE_BITS[scheme1+1>>3][_chooser->mode_ranks[scheme1][_mb_mode]];
}
else{
int ri;
/*For scheme 0, incrementing the mode count could potentially change the
mode's rank.
Find the index where the mode would be moved to in the optimal list,
and use its bit cost instead of the one for the mode's current
position in the list.*/
/*We don't recompute scheme bits; this is computing opportunity cost, not
an update.*/
for(ri=_chooser->scheme0_ranks[_mb_mode];ri>0&&
_chooser->mode_counts[_mb_mode]>=
_chooser->mode_counts[_chooser->scheme0_list[ri-1]];ri--);
scheme_bits=_chooser->scheme_bits[0]+OC_MODE_BITS[0][ri];
}
if(scheme_bits<best_bits)best_bits=scheme_bits;
if(++si>=8)break;
scheme1=_chooser->scheme_list[si];
}
while(_chooser->scheme_bits[scheme1]-_chooser->scheme_bits[scheme0]<=6);
return best_bits-_chooser->scheme_bits[scheme0];
}
/*Incrementally update the mode counts and per-scheme bit counts and re-order
the scheme lists once a mode has been selected.
_mb_mode: The mode that was chosen.*/
static void oc_mode_scheme_chooser_update(oc_mode_scheme_chooser *_chooser,
int _mb_mode){
int ri;
int si;
_chooser->mode_counts[_mb_mode]++;
/*Re-order the scheme0 mode list if necessary.*/
for(ri=_chooser->scheme0_ranks[_mb_mode];ri>0;ri--){
int pmode;
pmode=_chooser->scheme0_list[ri-1];
if(_chooser->mode_counts[pmode]>=_chooser->mode_counts[_mb_mode])break;
/*Reorder the mode ranking.*/
_chooser->scheme0_ranks[pmode]++;
_chooser->scheme0_list[ri]=pmode;
}
_chooser->scheme0_ranks[_mb_mode]=ri;
_chooser->scheme0_list[ri]=_mb_mode;
/*Now add the bit cost for the mode to each scheme.*/
for(si=0;si<8;si++){
_chooser->scheme_bits[si]+=
OC_MODE_BITS[si+1>>3][_chooser->mode_ranks[si][_mb_mode]];
}
/*Finally, re-order the list of schemes.*/
for(si=1;si<8;si++){
int sj;
int scheme0;
int bits0;
sj=si;
scheme0=_chooser->scheme_list[si];
bits0=_chooser->scheme_bits[scheme0];
do{
int scheme1;
scheme1=_chooser->scheme_list[sj-1];
if(bits0>=_chooser->scheme_bits[scheme1])break;
_chooser->scheme_list[sj]=scheme1;
}
while(--sj>0);
_chooser->scheme_list[sj]=scheme0;
}
}
/*The number of bits required to encode a super block run.
_run_count: The desired run count; must be positive and less than 4130.*/
static int oc_sb_run_bits(int _run_count){
int i;
for(i=0;_run_count>=OC_SB_RUN_VAL_MIN[i+1];i++);
return OC_SB_RUN_CODE_NBITS[i];
}
/*The number of bits required to encode a block run.
_run_count: The desired run count; must be positive and less than 30.*/
static int oc_block_run_bits(int _run_count){
return OC_BLOCK_RUN_CODE_NBITS[_run_count-1];
}
/*State to track coded block flags and their bit cost.*/
struct oc_fr_state{
ptrdiff_t bits;
unsigned sb_partial_count:16;
unsigned sb_full_count:16;
unsigned b_coded_count_prev:8;
unsigned b_coded_count:8;
unsigned b_count:8;
signed int sb_partial:2;
signed int sb_full:2;
signed int b_coded_prev:2;
signed int b_coded:2;
};
static void oc_fr_state_init(oc_fr_state *_fr){
_fr->bits=0;
_fr->sb_partial_count=0;
_fr->sb_full_count=0;
_fr->b_coded_count_prev=0;
_fr->b_coded_count=0;
_fr->b_count=0;
_fr->sb_partial=-1;
_fr->sb_full=-1;
_fr->b_coded_prev=-1;
_fr->b_coded=-1;
}
static void oc_fr_state_advance_sb(oc_fr_state *_fr,
int _sb_partial,int _sb_full){
ptrdiff_t bits;
int sb_partial_count;
int sb_full_count;
bits=_fr->bits;
/*Extend the sb_partial run, or start a new one.*/
sb_partial_count=_fr->sb_partial;
if(_fr->sb_partial==_sb_partial){
if(sb_partial_count>=4129){
bits++;
sb_partial_count=0;
}
else bits-=oc_sb_run_bits(sb_partial_count);
}
else sb_partial_count=0;
sb_partial_count++;
bits+=oc_sb_run_bits(sb_partial_count);
if(!_sb_partial){
/*Extend the sb_full run, or start a new one.*/
sb_full_count=_fr->sb_full_count;
if(_fr->sb_full==_sb_full){
if(sb_full_count>=4129){
bits++;
sb_full_count=0;
}
else bits-=oc_sb_run_bits(sb_full_count);
}
else sb_full_count=0;
sb_full_count++;
bits+=oc_sb_run_bits(sb_full_count);
_fr->sb_full=_sb_full;
_fr->sb_full_count=sb_full_count;
}
_fr->bits=bits;
_fr->sb_partial=_sb_partial;
_fr->sb_partial_count=sb_partial_count;
}
/*Flush any outstanding block flags for a SB (e.g., one with fewer than 16
blocks).*/
static void oc_fr_state_flush_sb(oc_fr_state *_fr){
ptrdiff_t bits;
int sb_partial;
int sb_full=sb_full;
int b_coded_count;
int b_coded;
int b_count;
b_count=_fr->b_count;
if(b_count>0){
bits=_fr->bits;
b_coded=_fr->b_coded;
b_coded_count=_fr->b_coded_count;
if(b_coded_count>=b_count){
/*This SB was fully coded/uncoded; roll back the partial block flags.*/
bits-=oc_block_run_bits(b_coded_count);
if(b_coded_count>b_count)bits+=oc_block_run_bits(b_coded_count-b_count);
sb_partial=0;
sb_full=b_coded;
b_coded=_fr->b_coded_prev;
b_coded_count=_fr->b_coded_count_prev;
}
else{
/*It was partially coded.*/
sb_partial=1;
/*sb_full is unused.*/
}
_fr->bits=bits;
_fr->b_coded_count=b_coded_count;
_fr->b_coded_count_prev=b_coded_count;
_fr->b_count=0;
_fr->b_coded=b_coded;
_fr->b_coded_prev=b_coded;
oc_fr_state_advance_sb(_fr,sb_partial,sb_full);
}
}
static void oc_fr_state_advance_block(oc_fr_state *_fr,int _b_coded){
ptrdiff_t bits;
int b_coded_count;
int b_count;
int sb_partial;
int sb_full=sb_full;
bits=_fr->bits;
/*Extend the b_coded run, or start a new one.*/
b_coded_count=_fr->b_coded_count;
if(_fr->b_coded==_b_coded)bits-=oc_block_run_bits(b_coded_count);
else b_coded_count=0;
b_coded_count++;
b_count=_fr->b_count+1;
if(b_count>=16){
/*We finished a superblock.*/
if(b_coded_count>=16){
/*It was fully coded/uncoded; roll back the partial block flags.*/
if(b_coded_count>16)bits+=oc_block_run_bits(b_coded_count-16);
sb_partial=0;
sb_full=_b_coded;
_b_coded=_fr->b_coded_prev;
b_coded_count=_fr->b_coded_count_prev;
}
else{
bits+=oc_block_run_bits(b_coded_count);
/*It was partially coded.*/
sb_partial=1;
/*sb_full is unused.*/
}
_fr->bits=bits;
_fr->b_coded_count=b_coded_count;
_fr->b_coded_count_prev=b_coded_count;
_fr->b_count=0;
_fr->b_coded=_b_coded;
_fr->b_coded_prev=_b_coded;
oc_fr_state_advance_sb(_fr,sb_partial,sb_full);
}
else{
bits+=oc_block_run_bits(b_coded_count);
_fr->bits=bits;
_fr->b_coded_count=b_coded_count;
_fr->b_count=b_count;
_fr->b_coded=_b_coded;
}
}
static void oc_fr_skip_block(oc_fr_state *_fr){
oc_fr_state_advance_block(_fr,0);
}
static void oc_fr_code_block(oc_fr_state *_fr){
oc_fr_state_advance_block(_fr,1);
}
static int oc_fr_cost1(const oc_fr_state *_fr){
oc_fr_state tmp;
ptrdiff_t bits;
*&tmp=*_fr;
oc_fr_skip_block(&tmp);
bits=tmp.bits;
*&tmp=*_fr;
oc_fr_code_block(&tmp);
return (int)(tmp.bits-bits);
}
static int oc_fr_cost4(const oc_fr_state *_pre,const oc_fr_state *_post){
oc_fr_state tmp;
*&tmp=*_pre;
oc_fr_skip_block(&tmp);
oc_fr_skip_block(&tmp);
oc_fr_skip_block(&tmp);
oc_fr_skip_block(&tmp);
return (int)(_post->bits-tmp.bits);
}
struct oc_qii_state{
ptrdiff_t bits;
unsigned qi01_count:14;
signed int qi01:2;
unsigned qi12_count:14;
signed int qi12:2;
};
static void oc_qii_state_init(oc_qii_state *_qs){
_qs->bits=0;
_qs->qi01_count=0;
_qs->qi01=-1;
_qs->qi12_count=0;
_qs->qi12=-1;
}
static void oc_qii_state_advance(oc_qii_state *_qd,
const oc_qii_state *_qs,int _qii){
ptrdiff_t bits;
int qi01;
int qi01_count;
int qi12;
int qi12_count;
bits=_qs->bits;
qi01=_qii+1>>1;
qi01_count=_qs->qi01_count;
if(qi01==_qs->qi01){
if(qi01_count>=4129){
bits++;
qi01_count=0;
}
else bits-=oc_sb_run_bits(qi01_count);
}
else qi01_count=0;
qi01_count++;
bits+=oc_sb_run_bits(qi01_count);
qi12_count=_qs->qi12_count;
if(_qii){
qi12=_qii>>1;
if(qi12==_qs->qi12){
if(qi12_count>=4129){
bits++;
qi12_count=0;
}
else bits-=oc_sb_run_bits(qi12_count);
}
else qi12_count=0;
qi12_count++;
bits+=oc_sb_run_bits(qi12_count);
}
else qi12=_qs->qi12;
_qd->bits=bits;
_qd->qi01=qi01;
_qd->qi01_count=qi01_count;
_qd->qi12=qi12;
_qd->qi12_count=qi12_count;
}
/*Temporary encoder state for the analysis pipeline.*/
struct oc_enc_pipeline_state{
int bounding_values[256];
oc_fr_state fr[3];
oc_qii_state qs[3];
/*Condensed dequantization tables.*/
const ogg_uint16_t *dequant[3][3][2];
/*Condensed quantization tables.*/
const oc_iquant *enquant[3][3][2];
/*Skip SSD storage for the current MCU in each plane.*/
unsigned *skip_ssd[3];
/*Coded/uncoded fragment lists for each plane for the current MCU.*/
ptrdiff_t *coded_fragis[3];
ptrdiff_t *uncoded_fragis[3];
ptrdiff_t ncoded_fragis[3];
ptrdiff_t nuncoded_fragis[3];
/*The starting fragment for the current MCU in each plane.*/
ptrdiff_t froffset[3];
/*The starting row for the current MCU in each plane.*/
int fragy0[3];
/*The ending row for the current MCU in each plane.*/
int fragy_end[3];
/*The starting superblock for the current MCU in each plane.*/
unsigned sbi0[3];
/*The ending superblock for the current MCU in each plane.*/
unsigned sbi_end[3];
/*The number of tokens for zzi=1 for each color plane.*/
int ndct_tokens1[3];
/*The outstanding eob_run count for zzi=1 for each color plane.*/
int eob_run1[3];
/*Whether or not the loop filter is enabled.*/
int loop_filter;
};
static void oc_enc_pipeline_init(oc_enc_ctx *_enc,oc_enc_pipeline_state *_pipe){
ptrdiff_t *coded_fragis;
unsigned mcu_nvsbs;
ptrdiff_t mcu_nfrags;
int hdec;
int vdec;
int pli;
int qii;
int qti;
/*Initialize the per-plane coded block flag trackers.
These are used for bit-estimation purposes only; the real flag bits span
all three planes, so we can't compute them in parallel.*/
for(pli=0;pli<3;pli++)oc_fr_state_init(_pipe->fr+pli);
for(pli=0;pli<3;pli++)oc_qii_state_init(_pipe->qs+pli);
/*Set up the per-plane skip SSD storage pointers.*/
mcu_nvsbs=_enc->mcu_nvsbs;
mcu_nfrags=mcu_nvsbs*_enc->state.fplanes[0].nhsbs*16;
hdec=!(_enc->state.info.pixel_fmt&1);
vdec=!(_enc->state.info.pixel_fmt&2);
_pipe->skip_ssd[0]=_enc->mcu_skip_ssd;
_pipe->skip_ssd[1]=_pipe->skip_ssd[0]+mcu_nfrags;
_pipe->skip_ssd[2]=_pipe->skip_ssd[1]+(mcu_nfrags>>hdec+vdec);
/*Set up per-plane pointers to the coded and uncoded fragments lists.
Unlike the decoder, each planes' coded and uncoded fragment list is kept
separate during the analysis stage; we only make the coded list for all
three planes contiguous right before the final packet is output
(destroying the uncoded lists, which are no longer needed).*/
coded_fragis=_enc->state.coded_fragis;
for(pli=0;pli<3;pli++){
_pipe->coded_fragis[pli]=coded_fragis;
coded_fragis+=_enc->state.fplanes[pli].nfrags;
_pipe->uncoded_fragis[pli]=coded_fragis;
}
memset(_pipe->ncoded_fragis,0,sizeof(_pipe->ncoded_fragis));
memset(_pipe->nuncoded_fragis,0,sizeof(_pipe->nuncoded_fragis));
/*Set up condensed quantizer tables.*/
for(pli=0;pli<3;pli++){
for(qii=0;qii<_enc->state.nqis;qii++){
int qi;
qi=_enc->state.qis[qii];
for(qti=0;qti<2;qti++){
_pipe->dequant[pli][qii][qti]=_enc->state.dequant_tables[qi][pli][qti];
_pipe->enquant[pli][qii][qti]=_enc->enquant_tables[qi][pli][qti];
}
}
}
/*Initialize the tokenization state.*/
for(pli=0;pli<3;pli++){
_pipe->ndct_tokens1[pli]=0;
_pipe->eob_run1[pli]=0;
}
/*Initialize the bounding value array for the loop filter.*/
_pipe->loop_filter=!oc_state_loop_filter_init(&_enc->state,
_pipe->bounding_values);
}
/*Sets the current MCU stripe to super block row _sby.
Return: A non-zero value if this was the last MCU.*/
static int oc_enc_pipeline_set_stripe(oc_enc_ctx *_enc,
oc_enc_pipeline_state *_pipe,int _sby){
const oc_fragment_plane *fplane;
unsigned mcu_nvsbs;
int sby_end;
int notdone;
int vdec;
int pli;
mcu_nvsbs=_enc->mcu_nvsbs;
sby_end=_enc->state.fplanes[0].nvsbs;
notdone=_sby+mcu_nvsbs<sby_end;
if(notdone)sby_end=_sby+mcu_nvsbs;
vdec=0;
for(pli=0;pli<3;pli++){
fplane=_enc->state.fplanes+pli;
_pipe->sbi0[pli]=fplane->sboffset+(_sby>>vdec)*fplane->nhsbs;
_pipe->fragy0[pli]=_sby<<2-vdec;
_pipe->froffset[pli]=fplane->froffset
+_pipe->fragy0[pli]*(ptrdiff_t)fplane->nhfrags;
if(notdone){
_pipe->sbi_end[pli]=fplane->sboffset+(sby_end>>vdec)*fplane->nhsbs;
_pipe->fragy_end[pli]=sby_end<<2-vdec;
}
else{
_pipe->sbi_end[pli]=fplane->sboffset+fplane->nsbs;
_pipe->fragy_end[pli]=fplane->nvfrags;
}
vdec=!(_enc->state.info.pixel_fmt&2);
}
return notdone;
}
static void oc_enc_pipeline_finish_mcu_plane(oc_enc_ctx *_enc,
oc_enc_pipeline_state *_pipe,int _pli,int _sdelay,int _edelay){
int refi;
/*Copy over all the uncoded fragments from this plane and advance the uncoded
fragment list.*/
_pipe->uncoded_fragis[_pli]-=_pipe->nuncoded_fragis[_pli];
oc_state_frag_copy_list(&_enc->state,_pipe->uncoded_fragis[_pli],
_pipe->nuncoded_fragis[_pli],OC_FRAME_SELF,OC_FRAME_PREV,_pli);
_pipe->nuncoded_fragis[_pli]=0;
/*Perform DC prediction.*/
oc_enc_pred_dc_frag_rows(_enc,_pli,
_pipe->fragy0[_pli],_pipe->fragy_end[_pli]);
/*Finish DC tokenization.*/
oc_enc_tokenize_dc_frag_list(_enc,_pli,
_pipe->coded_fragis[_pli],_pipe->ncoded_fragis[_pli],
_pipe->ndct_tokens1[_pli],_pipe->eob_run1[_pli]);
_pipe->ndct_tokens1[_pli]=_enc->ndct_tokens[_pli][1];
_pipe->eob_run1[_pli]=_enc->eob_run[_pli][1];
/*And advance the coded fragment list.*/
_enc->state.ncoded_fragis[_pli]+=_pipe->ncoded_fragis[_pli];
_pipe->coded_fragis[_pli]+=_pipe->ncoded_fragis[_pli];
_pipe->ncoded_fragis[_pli]=0;
/*Apply the loop filter if necessary.*/
refi=_enc->state.ref_frame_idx[OC_FRAME_SELF];
if(_pipe->loop_filter){
oc_state_loop_filter_frag_rows(&_enc->state,_pipe->bounding_values,
refi,_pli,_pipe->fragy0[_pli]-_sdelay,_pipe->fragy_end[_pli]-_edelay);
}
else _sdelay=_edelay=0;
/*To fill borders, we have an additional two pixel delay, since a fragment
in the next row could filter its top edge, using two pixels from a
fragment in this row.
But there's no reason to delay a full fragment between the two.*/
oc_state_borders_fill_rows(&_enc->state,refi,_pli,
(_pipe->fragy0[_pli]-_sdelay<<3)-(_sdelay<<1),
(_pipe->fragy_end[_pli]-_edelay<<3)-(_edelay<<1));
}
/*Cost information about the coded blocks in a MB.*/
struct oc_rd_metric{
int uncoded_ac_ssd;
int coded_ac_ssd;
int ac_bits;
int dc_flag;
};
static int oc_enc_block_transform_quantize(oc_enc_ctx *_enc,
oc_enc_pipeline_state *_pipe,int _pli,ptrdiff_t _fragi,int _overhead_bits,
oc_rd_metric *_mo,oc_token_checkpoint **_stack){
OC_ALIGN16(ogg_int16_t dct[64]);
OC_ALIGN16(ogg_int16_t data[64]);
ogg_uint16_t dc_dequant;
const ogg_uint16_t *dequant;
const oc_iquant *enquant;
ptrdiff_t frag_offs;
int ystride;
const unsigned char *src;
const unsigned char *ref;
unsigned char *dst;
int frame_type;
int nonzero;
unsigned uncoded_ssd;
unsigned coded_ssd;
int coded_dc;
oc_token_checkpoint *checkpoint;
oc_fragment *frags;
int mb_mode;
int mv_offs[2];
int nmv_offs;
int ac_bits;
int borderi;
int qti;
int qii;
int pi;
int zzi;
int v;
int val;
int d;
int s;
int dc;
frags=_enc->state.frags;
frag_offs=_enc->state.frag_buf_offs[_fragi];
ystride=_enc->state.ref_ystride[_pli];
src=_enc->state.ref_frame_data[OC_FRAME_IO]+frag_offs;
borderi=frags[_fragi].borderi;
qii=frags[_fragi].qii;
if(qii&~3){
#if !defined(OC_COLLECT_METRICS)
if(_enc->sp_level>=OC_SP_LEVEL_EARLY_SKIP){
/*Enable early skip detection.*/
frags[_fragi].coded=0;
return 0;
}
#endif
/*Try and code this block anyway.*/
qii&=3;
frags[_fragi].qii=qii;
}
mb_mode=frags[_fragi].mb_mode;
ref=_enc->state.ref_frame_data[
_enc->state.ref_frame_idx[OC_FRAME_FOR_MODE(mb_mode)]]+frag_offs;
dst=_enc->state.ref_frame_data[_enc->state.ref_frame_idx[OC_FRAME_SELF]]
+frag_offs;
/*Motion compensation:*/
switch(mb_mode){
case OC_MODE_INTRA:{
nmv_offs=0;
oc_enc_frag_sub_128(_enc,data,src,ystride);
}break;
case OC_MODE_GOLDEN_NOMV:
case OC_MODE_INTER_NOMV:{
nmv_offs=1;
mv_offs[0]=0;
oc_enc_frag_sub(_enc,data,src,ref,ystride);
}break;
default:{
const oc_mv *frag_mvs;
frag_mvs=(const oc_mv *)_enc->state.frag_mvs;
nmv_offs=oc_state_get_mv_offsets(&_enc->state,mv_offs,_pli,
frag_mvs[_fragi][0],frag_mvs[_fragi][1]);
if(nmv_offs>1){
oc_enc_frag_copy2(_enc,dst,
ref+mv_offs[0],ref+mv_offs[1],ystride);
oc_enc_frag_sub(_enc,data,src,dst,ystride);
}
else oc_enc_frag_sub(_enc,data,src,ref+mv_offs[0],ystride);
}break;
}
#if defined(OC_COLLECT_METRICS)
{
unsigned satd;
switch(nmv_offs){
case 0:satd=oc_enc_frag_intra_satd(_enc,src,ystride);break;
case 1:{
satd=oc_enc_frag_satd_thresh(_enc,src,ref+mv_offs[0],ystride,UINT_MAX);
}break;
default:{
satd=oc_enc_frag_satd_thresh(_enc,src,dst,ystride,UINT_MAX);
}
}
_enc->frag_satd[_fragi]=satd;
}
#endif
/*Transform:*/
oc_enc_fdct8x8(_enc,dct,data);
/*Quantize the DC coefficient:*/
qti=mb_mode!=OC_MODE_INTRA;
enquant=_pipe->enquant[_pli][0][qti];
dc_dequant=_pipe->dequant[_pli][0][qti][0];
v=dct[0];
val=v<<1;
s=OC_SIGNMASK(val);
val+=dc_dequant+s^s;
val=((enquant[0].m*(ogg_int32_t)val>>16)+val>>enquant[0].l)-s;
dc=OC_CLAMPI(-580,val,580);
nonzero=0;
/*Quantize the AC coefficients:*/
dequant=_pipe->dequant[_pli][qii][qti];
enquant=_pipe->enquant[_pli][qii][qti];
for(zzi=1;zzi<64;zzi++){
v=dct[OC_FZIG_ZAG[zzi]];
d=dequant[zzi];
val=v<<1;
v=abs(val);
if(v>=d){
s=OC_SIGNMASK(val);
/*The bias added here rounds ties away from zero, since token
optimization can only decrease the magnitude of the quantized
value.*/
val+=d+s^s;
/*Note the arithmetic right shift is not guaranteed by ANSI C.
Hopefully no one still uses ones-complement architectures.*/
val=((enquant[zzi].m*(ogg_int32_t)val>>16)+val>>enquant[zzi].l)-s;
data[zzi]=OC_CLAMPI(-580,val,580);
nonzero=zzi;
}
else data[zzi]=0;
}
/*Tokenize.*/
checkpoint=*_stack;
ac_bits=oc_enc_tokenize_ac(_enc,_pli,_fragi,data,dequant,dct,nonzero+1,
_stack,qti?0:3);
/*Reconstruct.
TODO: nonzero may need to be adjusted after tokenization.*/
if(nonzero==0){
ogg_int16_t p;
int ci;
/*We round this dequant product (and not any of the others) because there's
no iDCT rounding.*/
p=(ogg_int16_t)(dc*(ogg_int32_t)dc_dequant+15>>5);
/*LOOP VECTORIZES.*/
for(ci=0;ci<64;ci++)data[ci]=p;
}
else{
data[0]=dc*dc_dequant;
oc_idct8x8(&_enc->state,data,nonzero+1);
}
if(!qti)oc_enc_frag_recon_intra(_enc,dst,ystride,data);
else{
oc_enc_frag_recon_inter(_enc,dst,
nmv_offs==1?ref+mv_offs[0]:dst,ystride,data);
}
frame_type=_enc->state.frame_type;
#if !defined(OC_COLLECT_METRICS)
if(frame_type!=OC_INTRA_FRAME)
#endif
{
/*In retrospect, should we have skipped this block?*/
oc_enc_frag_sub(_enc,data,src,dst,ystride);
coded_ssd=coded_dc=0;
if(borderi<0){
for(pi=0;pi<64;pi++){
coded_ssd+=data[pi]*data[pi];
coded_dc+=data[pi];
}
}
else{
ogg_int64_t mask;
mask=_enc->state.borders[borderi].mask;
for(pi=0;pi<64;pi++,mask>>=1)if(mask&1){
coded_ssd+=data[pi]*data[pi];
coded_dc+=data[pi];
}
}
/*Scale to match DCT domain.*/
coded_ssd<<=4;
/*We actually only want the AC contribution to the SSD.*/
coded_ssd-=coded_dc*coded_dc>>2;
#if defined(OC_COLLECT_METRICS)
_enc->frag_ssd[_fragi]=coded_ssd;
}
if(frame_type!=OC_INTRA_FRAME){
#endif
uncoded_ssd=_pipe->skip_ssd[_pli][_fragi-_pipe->froffset[_pli]];
if(uncoded_ssd<UINT_MAX){
/*Although the fragment coding overhead determination is accurate, it is
greedy, using very coarse-grained local information.
Allowing it to mildly discourage coding turns out to be beneficial, but
it's not clear that allowing it to encourage coding through negative
coding overhead deltas is useful.
For that reason, we disallow negative coding_overheads.*/
if(_overhead_bits<0)_overhead_bits=0;
if(uncoded_ssd<=coded_ssd+(_overhead_bits+ac_bits)*_enc->lambda&&
/*Don't allow luma blocks to be skipped in 4MV mode when VP3
compatibility is enabled.*/
(!_enc->vp3_compatible||mb_mode!=OC_MODE_INTER_MV_FOUR||_pli)){
/*Hm, not worth it; roll back.*/
oc_enc_tokenlog_rollback(_enc,checkpoint,(*_stack)-checkpoint);
*_stack=checkpoint;
frags[_fragi].coded=0;
return 0;
}
}
else _mo->dc_flag=1;
_mo->uncoded_ac_ssd+=uncoded_ssd;
_mo->coded_ac_ssd+=coded_ssd;
_mo->ac_bits+=ac_bits;
}
oc_qii_state_advance(_pipe->qs+_pli,_pipe->qs+_pli,qii);
frags[_fragi].dc=dc;
frags[_fragi].coded=1;
return 1;
}
static int oc_enc_mb_transform_quantize_luma(oc_enc_ctx *_enc,
oc_enc_pipeline_state *_pipe,unsigned _mbi,int _mode_overhead){
/*Worst case token stack usage for 4 fragments.*/
oc_token_checkpoint stack[64*4];
oc_token_checkpoint *stackptr;
const oc_sb_map *sb_maps;
signed char *mb_modes;
oc_fragment *frags;
ptrdiff_t *coded_fragis;
ptrdiff_t ncoded_fragis;
ptrdiff_t *uncoded_fragis;
ptrdiff_t nuncoded_fragis;
oc_rd_metric mo;
oc_fr_state fr_checkpoint;
oc_qii_state qs_checkpoint;
int mb_mode;
int ncoded;
ptrdiff_t fragi;
int bi;
*&fr_checkpoint=*(_pipe->fr+0);
*&qs_checkpoint=*(_pipe->qs+0);
sb_maps=(const oc_sb_map *)_enc->state.sb_maps;
mb_modes=_enc->state.mb_modes;
frags=_enc->state.frags;
coded_fragis=_pipe->coded_fragis[0];
ncoded_fragis=_pipe->ncoded_fragis[0];
uncoded_fragis=_pipe->uncoded_fragis[0];
nuncoded_fragis=_pipe->nuncoded_fragis[0];
mb_mode=mb_modes[_mbi];
ncoded=0;
stackptr=stack;
memset(&mo,0,sizeof(mo));
for(bi=0;bi<4;bi++){
fragi=sb_maps[_mbi>>2][_mbi&3][bi];
frags[fragi].mb_mode=mb_mode;
if(oc_enc_block_transform_quantize(_enc,
_pipe,0,fragi,oc_fr_cost1(_pipe->fr+0),&mo,&stackptr)){
oc_fr_code_block(_pipe->fr+0);
coded_fragis[ncoded_fragis++]=fragi;
ncoded++;
}
else{
*(uncoded_fragis-++nuncoded_fragis)=fragi;
oc_fr_skip_block(_pipe->fr+0);
}
}
if(_enc->state.frame_type!=OC_INTRA_FRAME){
if(ncoded>0&&!mo.dc_flag){
int cost;
/*Some individual blocks were worth coding.
See if that's still true when accounting for mode and MV overhead.*/
cost=mo.coded_ac_ssd+_enc->lambda*(mo.ac_bits
+oc_fr_cost4(&fr_checkpoint,_pipe->fr+0)+_mode_overhead);
if(mo.uncoded_ac_ssd<=cost){
/*Taking macroblock overhead into account, it is not worth coding this
MB.*/
oc_enc_tokenlog_rollback(_enc,stack,stackptr-stack);
*(_pipe->fr+0)=*&fr_checkpoint;
*(_pipe->qs+0)=*&qs_checkpoint;
for(bi=0;bi<4;bi++){
fragi=sb_maps[_mbi>>2][_mbi&3][bi];
if(frags[fragi].coded){
*(uncoded_fragis-++nuncoded_fragis)=fragi;
frags[fragi].coded=0;
}
oc_fr_skip_block(_pipe->fr+0);
}
ncoded_fragis-=ncoded;
ncoded=0;
}
}
/*If no luma blocks coded, the mode is forced.*/
if(ncoded==0)mb_modes[_mbi]=OC_MODE_INTER_NOMV;
/*Assume that a 1MV with a single coded block is always cheaper than a 4MV
with a single coded block.
This may not be strictly true: a 4MV computes chroma MVs using (0,0) for
skipped blocks, while a 1MV does not.*/
else if(ncoded==1&&mb_mode==OC_MODE_INTER_MV_FOUR){
mb_modes[_mbi]=OC_MODE_INTER_MV;
}
}
_pipe->ncoded_fragis[0]=ncoded_fragis;
_pipe->nuncoded_fragis[0]=nuncoded_fragis;
return ncoded;
}
static void oc_enc_sb_transform_quantize_chroma(oc_enc_ctx *_enc,
oc_enc_pipeline_state *_pipe,int _pli,int _sbi_start,int _sbi_end){
const oc_sb_map *sb_maps;
oc_sb_flags *sb_flags;
ptrdiff_t *coded_fragis;
ptrdiff_t ncoded_fragis;
ptrdiff_t *uncoded_fragis;
ptrdiff_t nuncoded_fragis;
int sbi;
sb_maps=(const oc_sb_map *)_enc->state.sb_maps;
sb_flags=_enc->state.sb_flags;
coded_fragis=_pipe->coded_fragis[_pli];
ncoded_fragis=_pipe->ncoded_fragis[_pli];
uncoded_fragis=_pipe->uncoded_fragis[_pli];
nuncoded_fragis=_pipe->nuncoded_fragis[_pli];
for(sbi=_sbi_start;sbi<_sbi_end;sbi++){
/*Worst case token stack usage for 1 fragment.*/
oc_token_checkpoint stack[64];
oc_rd_metric mo;
int quadi;
int bi;
memset(&mo,0,sizeof(mo));
for(quadi=0;quadi<4;quadi++)for(bi=0;bi<4;bi++){
ptrdiff_t fragi;
fragi=sb_maps[sbi][quadi][bi];
if(fragi>=0){
oc_token_checkpoint *stackptr;
stackptr=stack;
if(oc_enc_block_transform_quantize(_enc,
_pipe,_pli,fragi,oc_fr_cost1(_pipe->fr+_pli),&mo,&stackptr)){
coded_fragis[ncoded_fragis++]=fragi;
oc_fr_code_block(_pipe->fr+_pli);
}
else{
*(uncoded_fragis-++nuncoded_fragis)=fragi;
oc_fr_skip_block(_pipe->fr+_pli);
}
}
}
oc_fr_state_flush_sb(_pipe->fr+_pli);
sb_flags[sbi].coded_fully=_pipe->fr[_pli].sb_full;
sb_flags[sbi].coded_partially=_pipe->fr[_pli].sb_partial;
}
_pipe->ncoded_fragis[_pli]=ncoded_fragis;
_pipe->nuncoded_fragis[_pli]=nuncoded_fragis;
}
/*Mode decision is done by exhaustively examining all potential choices.
Obviously, doing the motion compensation, fDCT, tokenization, and then
counting the bits each token uses is computationally expensive.
Theora's EOB runs can also split the cost of these tokens across multiple
fragments, and naturally we don't know what the optimal choice of Huffman
codes will be until we know all the tokens we're going to encode in all the
fragments.
So we use a simple approach to estimating the bit cost and distortion of each
mode based upon the SATD value of the residual before coding.
The mathematics behind the technique are outlined by Kim \cite{Kim03}, but
the process (modified somewhat from that of the paper) is very simple.
We build a non-linear regression of the mappings from
(pre-transform+quantization) SATD to (post-transform+quantization) bits and
SSD for each qi.
A separate set of mappings is kept for each quantization type and color
plane.
The mappings are constructed by partitioning the SATD values into a small
number of bins (currently 24) and using a linear regression in each bin
(as opposed to the 0th-order regression used by Kim).
The bit counts and SSD measurements are obtained by examining actual encoded
frames, with appropriate lambda values and optimal Huffman codes selected.
EOB bits are assigned to the fragment that started the EOB run (as opposed to
dividing them among all the blocks in the run; though the latter approach
seems more theoretically correct, Monty's testing showed a small improvement
with the former, though that may have been merely statistical noise).
@ARTICLE{Kim03,
author="Hyun Mun Kim",
title="Adaptive Rate Control Using Nonlinear Regression",
journal="IEEE Transactions on Circuits and Systems for Video Technology",
volume=13,
number=5,
pages="432--439",
month=May,
year=2003
}*/
/*Computes (_ssd+_lambda*_rate)/(1<<OC_BIT_SCALE) with rounding, avoiding
overflow for large lambda values.*/
#define OC_MODE_RD_COST(_ssd,_rate,_lambda) \
((_ssd)>>OC_BIT_SCALE)+((_rate)>>OC_BIT_SCALE)*(_lambda) \
+(((_ssd)&(1<<OC_BIT_SCALE)-1)+((_rate)&(1<<OC_BIT_SCALE)-1)*(_lambda) \
+((1<<OC_BIT_SCALE)>>1)>>OC_BIT_SCALE)
/*Estimate the R-D cost of the DCT coefficients given the SATD of a block after
prediction.*/
static unsigned oc_dct_cost2(unsigned *_ssd,
int _qi,int _pli,int _qti,int _satd){
unsigned rmse;
int bin;
int dx;
int y0;
int z0;
int dy;
int dz;
/*SATD metrics for chroma planes vary much less than luma, so we scale them
by 4 to distribute them into the mode decision bins more evenly.*/
_satd<<=_pli+1&2;
bin=OC_MINI(_satd>>OC_SAD_SHIFT,OC_SAD_BINS-2);
dx=_satd-(bin<<OC_SAD_SHIFT);
y0=OC_MODE_RD[_qi][_pli][_qti][bin].rate;
z0=OC_MODE_RD[_qi][_pli][_qti][bin].rmse;
dy=OC_MODE_RD[_qi][_pli][_qti][bin+1].rate-y0;
dz=OC_MODE_RD[_qi][_pli][_qti][bin+1].rmse-z0;
rmse=OC_MAXI(z0+(dz*dx>>OC_SAD_SHIFT),0);
*_ssd=rmse*rmse>>2*OC_RMSE_SCALE-OC_BIT_SCALE;
return OC_MAXI(y0+(dy*dx>>OC_SAD_SHIFT),0);
}
/*Select luma block-level quantizers for a MB in an INTRA frame.*/
static unsigned oc_analyze_intra_mb_luma(oc_enc_ctx *_enc,
const oc_qii_state *_qs,unsigned _mbi){
const unsigned char *src;
const ptrdiff_t *frag_buf_offs;
const oc_sb_map *sb_maps;
oc_fragment *frags;
ptrdiff_t frag_offs;
ptrdiff_t fragi;
oc_qii_state qs[4][3];
unsigned cost[4][3];
unsigned ssd[4][3];
unsigned rate[4][3];
int prev[3][3];
unsigned satd;
unsigned best_cost;
unsigned best_ssd;
unsigned best_rate;
int best_qii;
int qii;
int lambda;
int ystride;
int nqis;
int bi;
frag_buf_offs=_enc->state.frag_buf_offs;
sb_maps=(const oc_sb_map *)_enc->state.sb_maps;
src=_enc->state.ref_frame_data[OC_FRAME_IO];
ystride=_enc->state.ref_ystride[0];
fragi=sb_maps[_mbi>>2][_mbi&3][0];
frag_offs=frag_buf_offs[fragi];
satd=oc_enc_frag_intra_satd(_enc,src+frag_offs,ystride);
nqis=_enc->state.nqis;
lambda=_enc->lambda;
for(qii=0;qii<nqis;qii++){
oc_qii_state_advance(qs[0]+qii,_qs,qii);
rate[0][qii]=oc_dct_cost2(ssd[0]+qii,_enc->state.qis[qii],0,0,satd)
+(qs[0][qii].bits-_qs->bits<<OC_BIT_SCALE);
cost[0][qii]=OC_MODE_RD_COST(ssd[0][qii],rate[0][qii],lambda);
}
for(bi=1;bi<4;bi++){
fragi=sb_maps[_mbi>>2][_mbi&3][bi];
frag_offs=frag_buf_offs[fragi];
satd=oc_enc_frag_intra_satd(_enc,src+frag_offs,ystride);
for(qii=0;qii<nqis;qii++){
oc_qii_state qt[3];
unsigned cur_ssd;
unsigned cur_rate;
int best_qij;
int qij;
oc_qii_state_advance(qt+0,qs[bi-1]+0,qii);
cur_rate=oc_dct_cost2(&cur_ssd,_enc->state.qis[qii],0,0,satd);
best_ssd=ssd[bi-1][0]+cur_ssd;
best_rate=rate[bi-1][0]+cur_rate
+(qt[0].bits-qs[bi-1][0].bits<<OC_BIT_SCALE);
best_cost=OC_MODE_RD_COST(best_ssd,best_rate,lambda);
best_qij=0;
for(qij=1;qij<nqis;qij++){
unsigned chain_ssd;
unsigned chain_rate;
unsigned chain_cost;
oc_qii_state_advance(qt+qij,qs[bi-1]+qij,qii);
chain_ssd=ssd[bi-1][qij]+cur_ssd;
chain_rate=rate[bi-1][qij]+cur_rate
+(qt[qij].bits-qs[bi-1][qij].bits<<OC_BIT_SCALE);
chain_cost=OC_MODE_RD_COST(chain_ssd,chain_rate,lambda);
if(chain_cost<best_cost){
best_cost=chain_cost;
best_ssd=chain_ssd;
best_rate=chain_rate;
best_qij=qij;
}
}
*(qs[bi]+qii)=*(qt+best_qij);
cost[bi][qii]=best_cost;
ssd[bi][qii]=best_ssd;
rate[bi][qii]=best_rate;
prev[bi-1][qii]=best_qij;
}
}
best_qii=0;
best_cost=cost[3][0];
for(qii=1;qii<nqis;qii++){
if(cost[3][qii]<best_cost){
best_cost=cost[3][qii];
best_qii=qii;
}
}
frags=_enc->state.frags;
for(bi=3;;){
fragi=sb_maps[_mbi>>2][_mbi&3][bi];
frags[fragi].qii=best_qii;
if(bi--<=0)break;
best_qii=prev[bi][best_qii];
}
return best_cost;
}
/*Select a block-level quantizer for a single chroma block in an INTRA frame.*/
static unsigned oc_analyze_intra_chroma_block(oc_enc_ctx *_enc,
const oc_qii_state *_qs,int _pli,ptrdiff_t _fragi){
const unsigned char *src;
oc_fragment *frags;
ptrdiff_t frag_offs;
oc_qii_state qt[3];
unsigned cost[3];
unsigned satd;
unsigned best_cost;
int best_qii;
int qii;
int lambda;
int ystride;
int nqis;
src=_enc->state.ref_frame_data[OC_FRAME_IO];
ystride=_enc->state.ref_ystride[_pli];
frag_offs=_enc->state.frag_buf_offs[_fragi];
satd=oc_enc_frag_intra_satd(_enc,src+frag_offs,ystride);
nqis=_enc->state.nqis;
lambda=_enc->lambda;
best_qii=0;
for(qii=0;qii<nqis;qii++){
unsigned cur_rate;
unsigned cur_ssd;
oc_qii_state_advance(qt+qii,_qs,qii);
cur_rate=oc_dct_cost2(&cur_ssd,_enc->state.qis[qii],_pli,0,satd)
+(qt[qii].bits-_qs->bits<<OC_BIT_SCALE);
cost[qii]=OC_MODE_RD_COST(cur_ssd,cur_rate,lambda);
}
best_cost=cost[0];
for(qii=1;qii<nqis;qii++){
if(cost[qii]<best_cost){
best_cost=cost[qii];
best_qii=qii;
}
}
frags=_enc->state.frags;
frags[_fragi].qii=best_qii;
return best_cost;
}
static void oc_enc_sb_transform_quantize_intra_chroma(oc_enc_ctx *_enc,
oc_enc_pipeline_state *_pipe,int _pli,int _sbi_start,int _sbi_end){
const oc_sb_map *sb_maps;
oc_sb_flags *sb_flags;
ptrdiff_t *coded_fragis;
ptrdiff_t ncoded_fragis;
int sbi;
sb_maps=(const oc_sb_map *)_enc->state.sb_maps;
sb_flags=_enc->state.sb_flags;
coded_fragis=_pipe->coded_fragis[_pli];
ncoded_fragis=_pipe->ncoded_fragis[_pli];
for(sbi=_sbi_start;sbi<_sbi_end;sbi++){
/*Worst case token stack usage for 1 fragment.*/
oc_token_checkpoint stack[64];
int quadi;
int bi;
for(quadi=0;quadi<4;quadi++)for(bi=0;bi<4;bi++){
ptrdiff_t fragi;
fragi=sb_maps[sbi][quadi][bi];
if(fragi>=0){
oc_token_checkpoint *stackptr;
oc_analyze_intra_chroma_block(_enc,_pipe->qs+_pli,_pli,fragi);
stackptr=stack;
oc_enc_block_transform_quantize(_enc,
_pipe,_pli,fragi,0,NULL,&stackptr);
coded_fragis[ncoded_fragis++]=fragi;
}
}
}
_pipe->ncoded_fragis[_pli]=ncoded_fragis;
}
/*Analysis stage for an INTRA frame.*/
void oc_enc_analyze_intra(oc_enc_ctx *_enc,int _recode){
oc_enc_pipeline_state pipe;
const unsigned char *map_idxs;
int nmap_idxs;
oc_sb_flags *sb_flags;
signed char *mb_modes;
const oc_mb_map *mb_maps;
oc_mb_enc_info *embs;
oc_fragment *frags;
unsigned stripe_sby;
unsigned mcu_nvsbs;
int notstart;
int notdone;
int refi;
int pli;
_enc->state.frame_type=OC_INTRA_FRAME;
oc_enc_tokenize_start(_enc);
oc_enc_pipeline_init(_enc,&pipe);
/*Choose MVs and MB modes and quantize and code luma.
Must be done in Hilbert order.*/
map_idxs=OC_MB_MAP_IDXS[_enc->state.info.pixel_fmt];
nmap_idxs=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
_enc->state.ncoded_fragis[0]=0;
_enc->state.ncoded_fragis[1]=0;
_enc->state.ncoded_fragis[2]=0;
sb_flags=_enc->state.sb_flags;
mb_modes=_enc->state.mb_modes;
mb_maps=(const oc_mb_map *)_enc->state.mb_maps;
embs=_enc->mb_info;
frags=_enc->state.frags;
notstart=0;
notdone=1;
mcu_nvsbs=_enc->mcu_nvsbs;
for(stripe_sby=0;notdone;stripe_sby+=mcu_nvsbs){
unsigned sbi;
unsigned sbi_end;
notdone=oc_enc_pipeline_set_stripe(_enc,&pipe,stripe_sby);
sbi_end=pipe.sbi_end[0];
for(sbi=pipe.sbi0[0];sbi<sbi_end;sbi++){
int quadi;
/*Mode addressing is through Y plane, always 4 MB per SB.*/
for(quadi=0;quadi<4;quadi++)if(sb_flags[sbi].quad_valid&1<<quadi){
unsigned mbi;
int mapii;
int mapi;
int bi;
ptrdiff_t fragi;
mbi=sbi<<2|quadi;
/*Motion estimation:
We always do a basic 1MV search for all macroblocks, coded or not,
keyframe or not.*/
if(!_recode&&_enc->state.curframe_num>0)oc_mcenc_search(_enc,mbi);
oc_analyze_intra_mb_luma(_enc,pipe.qs+0,mbi);
mb_modes[mbi]=OC_MODE_INTRA;
oc_enc_mb_transform_quantize_luma(_enc,&pipe,mbi,0);
/*Propagate final MB mode and MVs to the chroma blocks.*/
for(mapii=4;mapii<nmap_idxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_maps[mbi][pli][bi];
frags[fragi].mb_mode=OC_MODE_INTRA;
}
}
}
oc_enc_pipeline_finish_mcu_plane(_enc,&pipe,0,notstart,notdone);
/*Code chroma planes.*/
for(pli=1;pli<3;pli++){
oc_enc_sb_transform_quantize_intra_chroma(_enc,&pipe,
pli,pipe.sbi0[pli],pipe.sbi_end[pli]);
oc_enc_pipeline_finish_mcu_plane(_enc,&pipe,pli,notstart,notdone);
}
notstart=1;
}
/*Finish filling in the reference frame borders.*/
refi=_enc->state.ref_frame_idx[OC_FRAME_SELF];
for(pli=0;pli<3;pli++)oc_state_borders_fill_caps(&_enc->state,refi,pli);
_enc->state.ntotal_coded_fragis=_enc->state.nfrags;
}
/*Cost information about a MB mode.*/
struct oc_mode_choice{
unsigned cost;
unsigned ssd;
unsigned rate;
unsigned overhead;
unsigned char qii[12];
};
static void oc_mode_set_cost(oc_mode_choice *_modec,int _lambda){
_modec->cost=OC_MODE_RD_COST(_modec->ssd,
_modec->rate+_modec->overhead,_lambda);
}
/*A set of skip SSD's to use to disable early skipping.*/
static const unsigned OC_NOSKIP[12]={
UINT_MAX,UINT_MAX,UINT_MAX,UINT_MAX,
UINT_MAX,UINT_MAX,UINT_MAX,UINT_MAX,
UINT_MAX,UINT_MAX,UINT_MAX,UINT_MAX
};
/*The estimated number of bits used by a coded chroma block to specify the AC
quantizer.
TODO: Currently this is just 0.5*log2(3) (estimating about 50% compression);
measurements suggest this is in the right ballpark, but it varies somewhat
with lambda.*/
#define OC_CHROMA_QII_RATE ((0xCAE00D1DU>>31-OC_BIT_SCALE)+1>>1)
static void oc_analyze_mb_mode_luma(oc_enc_ctx *_enc,
oc_mode_choice *_modec,const oc_fr_state *_fr,const oc_qii_state *_qs,
const unsigned _frag_satd[12],const unsigned _skip_ssd[12],int _qti){
oc_fr_state fr;
oc_qii_state qs;
unsigned ssd;
unsigned rate;
int overhead;
unsigned satd;
unsigned best_ssd;
unsigned best_rate;
int best_overhead;
int best_fri;
int best_qii;
unsigned cur_cost;
unsigned cur_ssd;
unsigned cur_rate;
int cur_overhead;
int lambda;
int nqis;
int nskipped;
int bi;
int qii;
lambda=_enc->lambda;
nqis=_enc->state.nqis;
/*We could do a trellis optimization here, but we don't make final skip
decisions until after transform+quantization, so the result wouldn't be
optimal anyway.
Instead we just use a greedy approach; for most SATD values, the
differences between the qiis are large enough to drown out the cost to
code the flags, anyway.*/
*&fr=*_fr;
*&qs=*_qs;
ssd=rate=overhead=nskipped=0;
for(bi=0;bi<4;bi++){
oc_fr_state ft[2];
oc_qii_state qt[3];
unsigned best_cost;
satd=_frag_satd[bi];
*(ft+0)=*&fr;
oc_fr_code_block(ft+0);
oc_qii_state_advance(qt+0,&qs,0);
best_overhead=(ft[0].bits-fr.bits<<OC_BIT_SCALE);
best_rate=oc_dct_cost2(&best_ssd,_enc->state.qis[0],0,_qti,satd)
+(qt[0].bits-qs.bits<<OC_BIT_SCALE);
best_cost=OC_MODE_RD_COST(ssd+best_ssd,rate+best_rate+best_overhead,lambda);
best_fri=0;
best_qii=0;
for(qii=1;qii<nqis;qii++){
oc_qii_state_advance(qt+qii,&qs,qii);
cur_rate=oc_dct_cost2(&cur_ssd,_enc->state.qis[qii],0,_qti,satd)
+(qt[qii].bits-qs.bits<<OC_BIT_SCALE);
cur_cost=OC_MODE_RD_COST(ssd+cur_ssd,rate+cur_rate+best_overhead,lambda);
if(cur_cost<best_cost){
best_cost=cur_cost;
best_ssd=cur_ssd;
best_rate=cur_rate;
best_qii=qii;
}
}
if(_skip_ssd[bi]<UINT_MAX&&nskipped<3){
*(ft+1)=*&fr;
oc_fr_skip_block(ft+1);
cur_overhead=ft[1].bits-fr.bits<<OC_BIT_SCALE;
cur_ssd=_skip_ssd[bi]<<OC_BIT_SCALE;
cur_cost=OC_MODE_RD_COST(ssd+cur_ssd,rate+cur_overhead,lambda);
if(cur_cost<=best_cost){
best_ssd=cur_ssd;
best_rate=0;
best_overhead=cur_overhead;
best_fri=1;
best_qii+=4;
}
}
rate+=best_rate;
ssd+=best_ssd;
overhead+=best_overhead;
*&fr=*(ft+best_fri);
if(best_fri==0)*&qs=*(qt+best_qii);
else nskipped++;
_modec->qii[bi]=best_qii;
}
_modec->ssd=ssd;
_modec->rate=rate;
_modec->overhead=OC_MAXI(overhead,0);
}
static void oc_analyze_mb_mode_chroma(oc_enc_ctx *_enc,
oc_mode_choice *_modec,const oc_fr_state *_fr,const oc_qii_state *_qs,
const unsigned _frag_satd[12],const unsigned _skip_ssd[12],int _qti){
unsigned ssd;
unsigned rate;
unsigned satd;
unsigned best_ssd;
unsigned best_rate;
int best_qii;
unsigned cur_cost;
unsigned cur_ssd;
unsigned cur_rate;
int lambda;
int nblocks;
int nqis;
int pli;
int bi;
int qii;
lambda=_enc->lambda;
nqis=_enc->state.nqis;
ssd=_modec->ssd;
rate=_modec->rate;
/*Because (except in 4:4:4 mode) we aren't considering chroma blocks in coded
order, we assume a constant overhead for coded block and qii flags.*/
nblocks=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
nblocks=(nblocks-4>>1)+4;
bi=4;
for(pli=1;pli<3;pli++){
for(;bi<nblocks;bi++){
unsigned best_cost;
satd=_frag_satd[bi];
best_rate=oc_dct_cost2(&best_ssd,_enc->state.qis[0],pli,_qti,satd)
+OC_CHROMA_QII_RATE;
best_cost=OC_MODE_RD_COST(ssd+best_ssd,rate+best_rate,lambda);
best_qii=0;
for(qii=1;qii<nqis;qii++){
cur_rate=oc_dct_cost2(&cur_ssd,_enc->state.qis[qii],0,_qti,satd)
+OC_CHROMA_QII_RATE;
cur_cost=OC_MODE_RD_COST(ssd+cur_ssd,rate+cur_rate,lambda);
if(cur_cost<best_cost){
best_cost=cur_cost;
best_ssd=cur_ssd;
best_rate=cur_rate;
best_qii=qii;
}
}
if(_skip_ssd[bi]<UINT_MAX){
cur_ssd=_skip_ssd[bi]<<OC_BIT_SCALE;
cur_cost=OC_MODE_RD_COST(ssd+cur_ssd,rate,lambda);
if(cur_cost<=best_cost){
best_ssd=cur_ssd;
best_rate=0;
best_qii+=4;
}
}
rate+=best_rate;
ssd+=best_ssd;
_modec->qii[bi]=best_qii;
}
nblocks=(nblocks-4<<1)+4;
}
_modec->ssd=ssd;
_modec->rate=rate;
}
static void oc_skip_cost(oc_enc_ctx *_enc,oc_enc_pipeline_state *_pipe,
unsigned _mbi,unsigned _ssd[12]){
OC_ALIGN16(ogg_int16_t buffer[64]);
const unsigned char *src;
const unsigned char *ref;
int ystride;
const oc_fragment *frags;
const ptrdiff_t *frag_buf_offs;
const ptrdiff_t *sb_map;
const oc_mb_map_plane *mb_map;
const unsigned char *map_idxs;
int map_nidxs;
ogg_int64_t mask;
unsigned uncoded_ssd;
int uncoded_dc;
unsigned dc_dequant;
int dc_flag;
int mapii;
int mapi;
int pli;
int bi;
ptrdiff_t fragi;
ptrdiff_t frag_offs;
int borderi;
int pi;
src=_enc->state.ref_frame_data[OC_FRAME_IO];
ref=_enc->state.ref_frame_data[_enc->state.ref_frame_idx[OC_FRAME_PREV]];
ystride=_enc->state.ref_ystride[0];
frags=_enc->state.frags;
frag_buf_offs=_enc->state.frag_buf_offs;
sb_map=_enc->state.sb_maps[_mbi>>2][_mbi&3];
dc_dequant=_enc->state.dequant_tables[_enc->state.qis[0]][0][1][0];
for(bi=0;bi<4;bi++){
fragi=sb_map[bi];
frag_offs=frag_buf_offs[fragi];
oc_enc_frag_sub(_enc,buffer,src+frag_offs,ref+frag_offs,ystride);
borderi=frags[fragi].borderi;
uncoded_ssd=uncoded_dc=0;
if(borderi<0){
for(pi=0;pi<64;pi++){
uncoded_ssd+=buffer[pi]*buffer[pi];
uncoded_dc+=buffer[pi];
}
}
else{
ogg_int64_t mask;
mask=_enc->state.borders[borderi].mask;
for(pi=0;pi<64;pi++,mask>>=1)if(mask&1){
uncoded_ssd+=buffer[pi]*buffer[pi];
uncoded_dc+=buffer[pi];
}
}
/*Scale to match DCT domain.*/
uncoded_ssd<<=4;
/*We actually only want the AC contribution to the SSD.*/
uncoded_ssd-=uncoded_dc*uncoded_dc>>2;
/*DC is a special case; if there's more than a full-quantizer improvement
in the effective DC component, always force-code the block.*/
dc_flag=abs(uncoded_dc)>dc_dequant<<1;
uncoded_ssd|=-dc_flag;
_pipe->skip_ssd[0][fragi-_pipe->froffset[0]]=_ssd[bi]=uncoded_ssd;
}
mb_map=(const oc_mb_map_plane *)_enc->state.mb_maps[_mbi];
map_nidxs=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
map_idxs=OC_MB_MAP_IDXS[_enc->state.info.pixel_fmt];
map_nidxs=(map_nidxs-4>>1)+4;
mapii=4;
for(pli=1;pli<3;pli++){
ystride=_enc->state.ref_ystride[pli];
dc_dequant=_enc->state.dequant_tables[_enc->state.qis[0]][pli][1][0];
for(;mapii<map_nidxs;mapii++){
mapi=map_idxs[mapii];
bi=mapi&3;
fragi=mb_map[pli][bi];
frag_offs=frag_buf_offs[fragi];
oc_enc_frag_sub(_enc,buffer,src+frag_offs,ref+frag_offs,ystride);
borderi=frags[fragi].borderi;
uncoded_ssd=uncoded_dc=0;
if(borderi<0){
for(pi=0;pi<64;pi++){
uncoded_ssd+=buffer[pi]*buffer[pi];
uncoded_dc+=buffer[pi];
}
}
else{
mask=_enc->state.borders[borderi].mask;
for(pi=0;pi<64;pi++,mask>>=1)if(mask&1){
uncoded_ssd+=buffer[pi]*buffer[pi];
uncoded_dc+=buffer[pi];
}
}
/*Scale to match DCT domain.*/
uncoded_ssd<<=4;
/*We actually only want the AC contribution to the SSD.*/
uncoded_ssd-=uncoded_dc*uncoded_dc>>2;
/*DC is a special case; if there's more than a full-quantizer improvement
in the effective DC component, always force-code the block.*/
dc_flag=abs(uncoded_dc)>dc_dequant<<1;
uncoded_ssd|=-dc_flag;
_pipe->skip_ssd[pli][fragi-_pipe->froffset[pli]]=_ssd[mapii]=uncoded_ssd;
}
map_nidxs=(map_nidxs-4<<1)+4;
}
}
static void oc_mb_intra_satd(oc_enc_ctx *_enc,unsigned _mbi,
unsigned _frag_satd[12]){
const unsigned char *src;
const ptrdiff_t *frag_buf_offs;
const ptrdiff_t *sb_map;
const oc_mb_map_plane *mb_map;
const unsigned char *map_idxs;
int map_nidxs;
int mapii;
int mapi;
int ystride;
int pli;
int bi;
ptrdiff_t fragi;
ptrdiff_t frag_offs;
frag_buf_offs=_enc->state.frag_buf_offs;
sb_map=_enc->state.sb_maps[_mbi>>2][_mbi&3];
src=_enc->state.ref_frame_data[OC_FRAME_IO];
ystride=_enc->state.ref_ystride[0];
for(bi=0;bi<4;bi++){
fragi=sb_map[bi];
frag_offs=frag_buf_offs[fragi];
_frag_satd[bi]=oc_enc_frag_intra_satd(_enc,src+frag_offs,ystride);
}
mb_map=(const oc_mb_map_plane *)_enc->state.mb_maps[_mbi];
map_idxs=OC_MB_MAP_IDXS[_enc->state.info.pixel_fmt];
map_nidxs=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
/*Note: This assumes ref_ystride[1]==ref_ystride[2].*/
ystride=_enc->state.ref_ystride[1];
for(mapii=4;mapii<map_nidxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_map[pli][bi];
frag_offs=frag_buf_offs[fragi];
_frag_satd[mapii]=oc_enc_frag_intra_satd(_enc,src+frag_offs,ystride);
}
}
static void oc_cost_intra(oc_enc_ctx *_enc,oc_mode_choice *_modec,
unsigned _mbi,const oc_fr_state *_fr,const oc_qii_state *_qs,
const unsigned _frag_satd[12],const unsigned _skip_ssd[12]){
oc_analyze_mb_mode_luma(_enc,_modec,_fr,_qs,_frag_satd,_skip_ssd,0);
oc_analyze_mb_mode_chroma(_enc,_modec,_fr,_qs,_frag_satd,_skip_ssd,0);
_modec->overhead+=
oc_mode_scheme_chooser_cost(&_enc->chooser,OC_MODE_INTRA)<<OC_BIT_SCALE;
oc_mode_set_cost(_modec,_enc->lambda);
}
static void oc_cost_inter(oc_enc_ctx *_enc,oc_mode_choice *_modec,
unsigned _mbi,int _mb_mode,const signed char *_mv,
const oc_fr_state *_fr,const oc_qii_state *_qs,const unsigned _skip_ssd[12]){
unsigned frag_satd[12];
const unsigned char *src;
const unsigned char *ref;
int ystride;
const ptrdiff_t *frag_buf_offs;
const ptrdiff_t *sb_map;
const oc_mb_map_plane *mb_map;
const unsigned char *map_idxs;
int map_nidxs;
int mapii;
int mapi;
int mv_offs[2];
int dx;
int dy;
int pli;
int bi;
ptrdiff_t fragi;
ptrdiff_t frag_offs;
src=_enc->state.ref_frame_data[OC_FRAME_IO];
ref=_enc->state.ref_frame_data[
_enc->state.ref_frame_idx[OC_FRAME_FOR_MODE(_mb_mode)]];
ystride=_enc->state.ref_ystride[0];
frag_buf_offs=_enc->state.frag_buf_offs;
sb_map=_enc->state.sb_maps[_mbi>>2][_mbi&3];
dx=_mv[0];
dy=_mv[1];
_modec->rate=_modec->ssd=0;
if(oc_state_get_mv_offsets(&_enc->state,mv_offs,0,dx,dy)>1){
for(bi=0;bi<4;bi++){
fragi=sb_map[bi];
frag_offs=frag_buf_offs[fragi];
frag_satd[bi]=oc_enc_frag_satd2_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ref+frag_offs+mv_offs[1],ystride,UINT_MAX);
}
}
else{
for(bi=0;bi<4;bi++){
fragi=sb_map[bi];
frag_offs=frag_buf_offs[fragi];
frag_satd[bi]=oc_enc_frag_satd_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ystride,UINT_MAX);
}
}
mb_map=(const oc_mb_map_plane *)_enc->state.mb_maps[_mbi];
map_idxs=OC_MB_MAP_IDXS[_enc->state.info.pixel_fmt];
map_nidxs=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
/*Note: This assumes ref_ystride[1]==ref_ystride[2].*/
ystride=_enc->state.ref_ystride[1];
if(oc_state_get_mv_offsets(&_enc->state,mv_offs,1,dx,dy)>1){
for(mapii=4;mapii<map_nidxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_map[pli][bi];
frag_offs=frag_buf_offs[fragi];
frag_satd[mapii]=oc_enc_frag_satd2_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ref+frag_offs+mv_offs[1],ystride,UINT_MAX);
}
}
else{
for(mapii=4;mapii<map_nidxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_map[pli][bi];
frag_offs=frag_buf_offs[fragi];
frag_satd[mapii]=oc_enc_frag_satd_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ystride,UINT_MAX);
}
}
oc_analyze_mb_mode_luma(_enc,_modec,_fr,_qs,frag_satd,_skip_ssd,1);
oc_analyze_mb_mode_chroma(_enc,_modec,_fr,_qs,frag_satd,_skip_ssd,1);
_modec->overhead+=
oc_mode_scheme_chooser_cost(&_enc->chooser,_mb_mode)<<OC_BIT_SCALE;
oc_mode_set_cost(_modec,_enc->lambda);
}
static void oc_cost_inter_nomv(oc_enc_ctx *_enc,oc_mode_choice *_modec,
unsigned _mbi,int _mb_mode,const oc_fr_state *_fr,const oc_qii_state *_qs,
const unsigned _skip_ssd[12]){
static const oc_mv OC_MV_ZERO;
oc_cost_inter(_enc,_modec,_mbi,_mb_mode,OC_MV_ZERO,_fr,_qs,_skip_ssd);
}
static int oc_cost_inter1mv(oc_enc_ctx *_enc,oc_mode_choice *_modec,
unsigned _mbi,int _mb_mode,const signed char *_mv,
const oc_fr_state *_fr,const oc_qii_state *_qs,const unsigned _skip_ssd[12]){
int bits0;
oc_cost_inter(_enc,_modec,_mbi,_mb_mode,_mv,_fr,_qs,_skip_ssd);
bits0=OC_MV_BITS[0][_mv[0]+31]+OC_MV_BITS[0][_mv[1]+31];
_modec->overhead+=OC_MINI(_enc->mv_bits[0]+bits0,_enc->mv_bits[1]+12)
-OC_MINI(_enc->mv_bits[0],_enc->mv_bits[1])<<OC_BIT_SCALE;
oc_mode_set_cost(_modec,_enc->lambda);
return bits0;
}
/*A mapping from oc_mb_map (raster) ordering to oc_sb_map (Hilbert) ordering.*/
static const unsigned char OC_MB_PHASE[4][4]={
{0,1,3,2},{0,3,1,2},{0,3,1,2},{2,3,1,0}
};
static void oc_cost_inter4mv(oc_enc_ctx *_enc,oc_mode_choice *_modec,
unsigned _mbi,oc_mv _mv[4],const oc_fr_state *_fr,const oc_qii_state *_qs,
const unsigned _skip_ssd[12]){
unsigned frag_satd[12];
oc_mv lbmvs[4];
oc_mv cbmvs[4];
const unsigned char *src;
const unsigned char *ref;
int ystride;
const ptrdiff_t *frag_buf_offs;
oc_mv *frag_mvs;
const oc_mb_map_plane *mb_map;
const unsigned char *map_idxs;
int map_nidxs;
int nqis;
int mapii;
int mapi;
int mv_offs[2];
int dx;
int dy;
int pli;
int bi;
ptrdiff_t fragi;
ptrdiff_t frag_offs;
int bits0;
int bits1;
unsigned satd;
src=_enc->state.ref_frame_data[OC_FRAME_IO];
ref=_enc->state.ref_frame_data[_enc->state.ref_frame_idx[OC_FRAME_PREV]];
ystride=_enc->state.ref_ystride[0];
frag_buf_offs=_enc->state.frag_buf_offs;
frag_mvs=_enc->state.frag_mvs;
mb_map=(const oc_mb_map_plane *)_enc->state.mb_maps[_mbi];
_modec->rate=_modec->ssd=0;
for(bi=0;bi<4;bi++){
fragi=mb_map[0][bi];
dx=_mv[bi][0];
dy=_mv[bi][1];
/*Save the block MVs as the current ones while we're here; we'll replace
them if we don't ultimately choose 4MV mode.*/
frag_mvs[fragi][0]=(signed char)dx;
frag_mvs[fragi][1]=(signed char)dy;
frag_offs=frag_buf_offs[fragi];
if(oc_state_get_mv_offsets(&_enc->state,mv_offs,0,dx,dy)>1){
satd=oc_enc_frag_satd2_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ref+frag_offs+mv_offs[1],ystride,UINT_MAX);
}
else{
satd=oc_enc_frag_satd_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ystride,UINT_MAX);
}
frag_satd[OC_MB_PHASE[_mbi&3][bi]]=satd;
}
oc_analyze_mb_mode_luma(_enc,_modec,_fr,_qs,frag_satd,
_enc->vp3_compatible?OC_NOSKIP:_skip_ssd,1);
/*Figure out which blocks are being skipped and give them (0,0) MVs.*/
bits0=0;
bits1=0;
nqis=_enc->state.nqis;
for(bi=0;bi<4;bi++){
if(_modec->qii[OC_MB_PHASE[_mbi&3][bi]]>=nqis){
memset(lbmvs+bi,0,sizeof(*lbmvs));
}
else{
memcpy(lbmvs+bi,_mv+bi,sizeof(*lbmvs));
bits0+=OC_MV_BITS[0][_mv[bi][0]+31]+OC_MV_BITS[0][_mv[bi][1]+31];
bits1+=12;
}
}
(*OC_SET_CHROMA_MVS_TABLE[_enc->state.info.pixel_fmt])(cbmvs,
(const oc_mv *)lbmvs);
map_idxs=OC_MB_MAP_IDXS[_enc->state.info.pixel_fmt];
map_nidxs=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
/*Note: This assumes ref_ystride[1]==ref_ystride[2].*/
ystride=_enc->state.ref_ystride[1];
for(mapii=4;mapii<map_nidxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_map[pli][bi];
dx=cbmvs[bi][0];
dy=cbmvs[bi][1];
frag_offs=frag_buf_offs[fragi];
/*TODO: We could save half these calls by re-using the results for the Cb
and Cr planes; is it worth it?*/
if(oc_state_get_mv_offsets(&_enc->state,mv_offs,pli,dx,dy)>1){
satd=oc_enc_frag_satd2_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ref+frag_offs+mv_offs[1],ystride,UINT_MAX);
}
else{
satd=oc_enc_frag_satd_thresh(_enc,src+frag_offs,
ref+frag_offs+mv_offs[0],ystride,UINT_MAX);
}
frag_satd[mapii]=satd;
}
oc_analyze_mb_mode_chroma(_enc,_modec,_fr,_qs,frag_satd,_skip_ssd,1);
_modec->overhead+=
oc_mode_scheme_chooser_cost(&_enc->chooser,OC_MODE_INTER_MV_FOUR)
+OC_MINI(_enc->mv_bits[0]+bits0,_enc->mv_bits[1]+bits1)
-OC_MINI(_enc->mv_bits[0],_enc->mv_bits[1])<<OC_BIT_SCALE;
oc_mode_set_cost(_modec,_enc->lambda);
}
int oc_enc_analyze_inter(oc_enc_ctx *_enc,int _allow_keyframe,int _recode){
oc_set_chroma_mvs_func set_chroma_mvs;
oc_enc_pipeline_state pipe;
oc_qii_state intra_luma_qs;
oc_mv last_mv;
oc_mv prior_mv;
ogg_int64_t interbits;
ogg_int64_t intrabits;
const unsigned char *map_idxs;
int nmap_idxs;
unsigned *coded_mbis;
unsigned *uncoded_mbis;
size_t ncoded_mbis;
size_t nuncoded_mbis;
oc_sb_flags *sb_flags;
signed char *mb_modes;
const oc_sb_map *sb_maps;
const oc_mb_map *mb_maps;
oc_mb_enc_info *embs;
oc_fragment *frags;
oc_mv *frag_mvs;
int qi;
unsigned stripe_sby;
unsigned mcu_nvsbs;
int notstart;
int notdone;
int vdec;
unsigned sbi;
unsigned sbi_end;
int refi;
int pli;
set_chroma_mvs=OC_SET_CHROMA_MVS_TABLE[_enc->state.info.pixel_fmt];
_enc->state.frame_type=OC_INTER_FRAME;
oc_mode_scheme_chooser_reset(&_enc->chooser);
oc_enc_tokenize_start(_enc);
oc_enc_pipeline_init(_enc,&pipe);
if(_allow_keyframe)oc_qii_state_init(&intra_luma_qs);
_enc->mv_bits[0]=_enc->mv_bits[1]=0;
interbits=intrabits=0;
last_mv[0]=last_mv[1]=prior_mv[0]=prior_mv[1]=0;
/*Choose MVs and MB modes and quantize and code luma.
Must be done in Hilbert order.*/
map_idxs=OC_MB_MAP_IDXS[_enc->state.info.pixel_fmt];
nmap_idxs=OC_MB_MAP_NIDXS[_enc->state.info.pixel_fmt];
qi=_enc->state.qis[0];
coded_mbis=_enc->coded_mbis;
uncoded_mbis=coded_mbis+_enc->state.nmbs;
ncoded_mbis=0;
nuncoded_mbis=0;
_enc->state.ncoded_fragis[0]=0;
_enc->state.ncoded_fragis[1]=0;
_enc->state.ncoded_fragis[2]=0;
sb_flags=_enc->state.sb_flags;
mb_modes=_enc->state.mb_modes;
sb_maps=(const oc_sb_map *)_enc->state.sb_maps;
mb_maps=(const oc_mb_map *)_enc->state.mb_maps;
embs=_enc->mb_info;
frags=_enc->state.frags;
frag_mvs=_enc->state.frag_mvs;
vdec=!(_enc->state.info.pixel_fmt&2);
notstart=0;
notdone=1;
mcu_nvsbs=_enc->mcu_nvsbs;
for(stripe_sby=0;notdone;stripe_sby+=mcu_nvsbs){
notdone=oc_enc_pipeline_set_stripe(_enc,&pipe,stripe_sby);
sbi_end=pipe.sbi_end[0];
for(sbi=pipe.sbi0[0];sbi<sbi_end;sbi++){
int quadi;
/*Mode addressing is through Y plane, always 4 MB per SB.*/
for(quadi=0;quadi<4;quadi++)if(sb_flags[sbi].quad_valid&1<<quadi){
oc_mode_choice modes[8];
unsigned skip_ssd[12];
unsigned intra_satd[12];
int mb_mv_bits_0;
int mb_gmv_bits_0;
int inter_mv_pref;
int mb_mode;
int dx;
int dy;
unsigned mbi;
int mapii;
int mapi;
int bi;
ptrdiff_t fragi;
mbi=sbi<<2|quadi;
/*Motion estimation:
We always do a basic 1MV search for all macroblocks, coded or not,
keyframe or not.*/
if(!_recode&&_enc->sp_level<OC_SP_LEVEL_NOMC)oc_mcenc_search(_enc,mbi);
dx=dy=0;
/*Find the block choice with the lowest estimated coding cost.
If a Cb or Cr block is coded but no Y' block from a macro block then
the mode MUST be OC_MODE_INTER_NOMV.
This is the default state to which the mode data structure is
initialised in encoder and decoder at the start of each frame.*/
/*Block coding cost is estimated from correlated SATD metrics.*/
/*At this point, all blocks that are in frame are still marked coded.*/
if(!_recode){
memcpy(embs[mbi].unref_mv,
embs[mbi].analysis_mv[0],sizeof(embs[mbi].unref_mv));
embs[mbi].refined=0;
}
oc_mb_intra_satd(_enc,mbi,intra_satd);
/*Estimate the cost of coding this MB in a keyframe.*/
if(_allow_keyframe){
oc_cost_intra(_enc,modes+OC_MODE_INTRA,mbi,
pipe.fr+0,&intra_luma_qs,intra_satd,OC_NOSKIP);
intrabits+=modes[OC_MODE_INTRA].rate;
for(bi=0;bi<4;bi++){
oc_qii_state_advance(&intra_luma_qs,&intra_luma_qs,
modes[OC_MODE_INTRA].qii[bi]);
}
}
/*Estimate the cost in a delta frame for various modes.*/
oc_skip_cost(_enc,&pipe,mbi,skip_ssd);
oc_cost_inter_nomv(_enc,modes+OC_MODE_INTER_NOMV,mbi,
OC_MODE_INTER_NOMV,pipe.fr+0,pipe.qs+0,skip_ssd);
if(_enc->sp_level<OC_SP_LEVEL_NOMC){
oc_cost_intra(_enc,modes+OC_MODE_INTRA,mbi,
pipe.fr+0,pipe.qs+0,intra_satd,skip_ssd);
mb_mv_bits_0=oc_cost_inter1mv(_enc,modes+OC_MODE_INTER_MV,mbi,
OC_MODE_INTER_MV,embs[mbi].unref_mv[OC_FRAME_PREV],
pipe.fr+0,pipe.qs+0,skip_ssd);
oc_cost_inter(_enc,modes+OC_MODE_INTER_MV_LAST,mbi,
OC_MODE_INTER_MV_LAST,last_mv,pipe.fr+0,pipe.qs+0,skip_ssd);
oc_cost_inter(_enc,modes+OC_MODE_INTER_MV_LAST2,mbi,
OC_MODE_INTER_MV_LAST2,prior_mv,pipe.fr+0,pipe.qs+0,skip_ssd);
oc_cost_inter4mv(_enc,modes+OC_MODE_INTER_MV_FOUR,mbi,
embs[mbi].block_mv,pipe.fr+0,pipe.qs+0,skip_ssd);
oc_cost_inter_nomv(_enc,modes+OC_MODE_GOLDEN_NOMV,mbi,
OC_MODE_GOLDEN_NOMV,pipe.fr+0,pipe.qs+0,skip_ssd);
mb_gmv_bits_0=oc_cost_inter1mv(_enc,modes+OC_MODE_GOLDEN_MV,mbi,
OC_MODE_GOLDEN_MV,embs[mbi].unref_mv[OC_FRAME_GOLD],
pipe.fr+0,pipe.qs+0,skip_ssd);
/*The explicit MV modes (2,6,7) have not yet gone through halfpel
refinement.
We choose the explicit MV mode that's already furthest ahead on
R-D cost and refine only that one.
We have to be careful to remember which ones we've refined so that
we don't refine it again if we re-encode this frame.*/
inter_mv_pref=_enc->lambda*3;
if(modes[OC_MODE_INTER_MV_FOUR].cost<modes[OC_MODE_INTER_MV].cost&&
modes[OC_MODE_INTER_MV_FOUR].cost<modes[OC_MODE_GOLDEN_MV].cost){
if(!(embs[mbi].refined&0x80)){
oc_mcenc_refine4mv(_enc,mbi);
embs[mbi].refined|=0x80;
}
oc_cost_inter4mv(_enc,modes+OC_MODE_INTER_MV_FOUR,mbi,
embs[mbi].ref_mv,pipe.fr+0,pipe.qs+0,skip_ssd);
}
else if(modes[OC_MODE_GOLDEN_MV].cost+inter_mv_pref<
modes[OC_MODE_INTER_MV].cost){
if(!(embs[mbi].refined&0x40)){
oc_mcenc_refine1mv(_enc,mbi,OC_FRAME_GOLD);
embs[mbi].refined|=0x40;
}
mb_gmv_bits_0=oc_cost_inter1mv(_enc,modes+OC_MODE_GOLDEN_MV,mbi,
OC_MODE_GOLDEN_MV,embs[mbi].analysis_mv[0][OC_FRAME_GOLD],
pipe.fr+0,pipe.qs+0,skip_ssd);
}
if(!(embs[mbi].refined&0x04)){
oc_mcenc_refine1mv(_enc,mbi,OC_FRAME_PREV);
embs[mbi].refined|=0x04;
}
mb_mv_bits_0=oc_cost_inter1mv(_enc,modes+OC_MODE_INTER_MV,mbi,
OC_MODE_INTER_MV,embs[mbi].analysis_mv[0][OC_FRAME_PREV],
pipe.fr+0,pipe.qs+0,skip_ssd);
/*Finally, pick the mode with the cheapest estimated R-D cost.*/
mb_mode=OC_MODE_INTER_NOMV;
if(modes[OC_MODE_INTRA].cost<modes[OC_MODE_INTER_NOMV].cost){
mb_mode=OC_MODE_INTRA;
}
if(modes[OC_MODE_INTER_MV_LAST].cost<modes[mb_mode].cost){
mb_mode=OC_MODE_INTER_MV_LAST;
}
if(modes[OC_MODE_INTER_MV_LAST2].cost<modes[mb_mode].cost){
mb_mode=OC_MODE_INTER_MV_LAST2;
}
if(modes[OC_MODE_GOLDEN_NOMV].cost<modes[mb_mode].cost){
mb_mode=OC_MODE_GOLDEN_NOMV;
}
if(modes[OC_MODE_GOLDEN_MV].cost<modes[mb_mode].cost){
mb_mode=OC_MODE_GOLDEN_MV;
}
if(modes[OC_MODE_INTER_MV_FOUR].cost<modes[mb_mode].cost){
mb_mode=OC_MODE_INTER_MV_FOUR;
}
/*We prefer OC_MODE_INTER_MV, but not over LAST and LAST2.*/
if(mb_mode==OC_MODE_INTER_MV_LAST||mb_mode==OC_MODE_INTER_MV_LAST2){
inter_mv_pref=0;
}
if(modes[OC_MODE_INTER_MV].cost<modes[mb_mode].cost+inter_mv_pref){
mb_mode=OC_MODE_INTER_MV;
}
}
else{
oc_cost_inter_nomv(_enc,modes+OC_MODE_GOLDEN_NOMV,mbi,
OC_MODE_GOLDEN_NOMV,pipe.fr+0,pipe.qs+0,skip_ssd);
mb_mode=OC_MODE_INTER_NOMV;
if(modes[OC_MODE_INTRA].cost<modes[OC_MODE_INTER_NOMV].cost){
mb_mode=OC_MODE_INTRA;
}
if(modes[OC_MODE_GOLDEN_NOMV].cost<modes[mb_mode].cost){
mb_mode=OC_MODE_GOLDEN_NOMV;
}
mb_mv_bits_0=mb_gmv_bits_0=0;
}
mb_modes[mbi]=mb_mode;
/*Propagate the MVs to the luma blocks.*/
if(mb_mode!=OC_MODE_INTER_MV_FOUR){
switch(mb_mode){
case OC_MODE_INTER_MV:{
dx=embs[mbi].analysis_mv[0][OC_FRAME_PREV][0];
dy=embs[mbi].analysis_mv[0][OC_FRAME_PREV][1];
}break;
case OC_MODE_INTER_MV_LAST:{
dx=last_mv[0];
dy=last_mv[1];
}break;
case OC_MODE_INTER_MV_LAST2:{
dx=prior_mv[0];
dy=prior_mv[1];
}break;
case OC_MODE_GOLDEN_MV:{
dx=embs[mbi].analysis_mv[0][OC_FRAME_GOLD][0];
dy=embs[mbi].analysis_mv[0][OC_FRAME_GOLD][1];
}break;
}
for(bi=0;bi<4;bi++){
fragi=mb_maps[mbi][0][bi];
frag_mvs[fragi][0]=(signed char)dx;
frag_mvs[fragi][1]=(signed char)dy;
}
}
for(bi=0;bi<4;bi++){
fragi=sb_maps[mbi>>2][mbi&3][bi];
frags[fragi].qii=modes[mb_mode].qii[bi];
}
if(oc_enc_mb_transform_quantize_luma(_enc,&pipe,mbi,
modes[mb_mode].overhead>>OC_BIT_SCALE)>0){
int orig_mb_mode;
orig_mb_mode=mb_mode;
mb_mode=mb_modes[mbi];
switch(mb_mode){
case OC_MODE_INTER_MV:{
memcpy(prior_mv,last_mv,sizeof(prior_mv));
/*If we're backing out from 4MV, find the MV we're actually
using.*/
if(orig_mb_mode==OC_MODE_INTER_MV_FOUR){
for(bi=0;;bi++){
fragi=mb_maps[mbi][0][bi];
if(frags[fragi].coded){
memcpy(last_mv,frag_mvs[fragi],sizeof(last_mv));
dx=frag_mvs[fragi][0];
dy=frag_mvs[fragi][1];
break;
}
}
mb_mv_bits_0=OC_MV_BITS[0][dx+31]+OC_MV_BITS[0][dy+31];
}
/*Otherwise we used the original analysis MV.*/
else{
memcpy(last_mv,
embs[mbi].analysis_mv[0][OC_FRAME_PREV],sizeof(last_mv));
}
_enc->mv_bits[0]+=mb_mv_bits_0;
_enc->mv_bits[1]+=12;
}break;
case OC_MODE_INTER_MV_LAST2:{
oc_mv tmp_mv;
memcpy(tmp_mv,prior_mv,sizeof(tmp_mv));
memcpy(prior_mv,last_mv,sizeof(prior_mv));
memcpy(last_mv,tmp_mv,sizeof(last_mv));
}break;
case OC_MODE_GOLDEN_MV:{
_enc->mv_bits[0]+=mb_gmv_bits_0;
_enc->mv_bits[1]+=12;
}break;
case OC_MODE_INTER_MV_FOUR:{
oc_mv lbmvs[4];
oc_mv cbmvs[4];
memcpy(prior_mv,last_mv,sizeof(prior_mv));
for(bi=0;bi<4;bi++){
fragi=mb_maps[mbi][0][bi];
if(frags[fragi].coded){
memcpy(last_mv,frag_mvs[fragi],sizeof(last_mv));
memcpy(lbmvs[bi],frag_mvs[fragi],sizeof(lbmvs[bi]));
_enc->mv_bits[0]+=OC_MV_BITS[0][frag_mvs[fragi][0]+31]
+OC_MV_BITS[0][frag_mvs[fragi][1]+31];
_enc->mv_bits[1]+=12;
}
/*Replace the block MVs for not-coded blocks with (0,0).*/
else memset(lbmvs[bi],0,sizeof(lbmvs[bi]));
}
(*set_chroma_mvs)(cbmvs,(const oc_mv *)lbmvs);
for(mapii=4;mapii<nmap_idxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_maps[mbi][pli][bi];
frags[fragi].mb_mode=mb_mode;
frags[fragi].qii=modes[OC_MODE_INTER_MV_FOUR].qii[mapii];
memcpy(frag_mvs[fragi],cbmvs[bi],sizeof(frag_mvs[fragi]));
}
}break;
}
coded_mbis[ncoded_mbis++]=mbi;
oc_mode_scheme_chooser_update(&_enc->chooser,mb_mode);
interbits+=modes[mb_mode].rate+modes[mb_mode].overhead;
}
else{
*(uncoded_mbis-++nuncoded_mbis)=mbi;
mb_mode=OC_MODE_INTER_NOMV;
dx=dy=0;
}
/*Propagate final MB mode and MVs to the chroma blocks.
This has already been done for 4MV mode, since it requires individual
block motion vectors.*/
if(mb_mode!=OC_MODE_INTER_MV_FOUR){
for(mapii=4;mapii<nmap_idxs;mapii++){
mapi=map_idxs[mapii];
pli=mapi>>2;
bi=mapi&3;
fragi=mb_maps[mbi][pli][bi];
frags[fragi].mb_mode=mb_mode;
/*If we switched from 4MV mode to INTER_MV mode, then the qii
values won't have been chosen with the right MV, but it's
probaby not worth re-estimating them.*/
frags[fragi].qii=modes[mb_mode].qii[mapii];
frag_mvs[fragi][0]=(signed char)dx;
frag_mvs[fragi][1]=(signed char)dy;
}
}
}
oc_fr_state_flush_sb(pipe.fr+0);
sb_flags[sbi].coded_fully=pipe.fr[0].sb_full;
sb_flags[sbi].coded_partially=pipe.fr[0].sb_partial;
}
oc_enc_pipeline_finish_mcu_plane(_enc,&pipe,0,notstart,notdone);
/*Code chroma planes.*/
for(pli=1;pli<3;pli++){
oc_enc_sb_transform_quantize_chroma(_enc,&pipe,
pli,pipe.sbi0[pli],pipe.sbi_end[pli]);
oc_enc_pipeline_finish_mcu_plane(_enc,&pipe,pli,notstart,notdone);
}
notstart=1;
}
/*Finish filling in the reference frame borders.*/
refi=_enc->state.ref_frame_idx[OC_FRAME_SELF];
for(pli=0;pli<3;pli++)oc_state_borders_fill_caps(&_enc->state,refi,pli);
/*Finish adding flagging overhead costs to inter bit counts to determine if
we should have coded a key frame instead.*/
if(_allow_keyframe){
if(interbits>intrabits)return 1;
/*Technically the chroma plane counts are over-estimations, because they
don't account for continuing runs from the luma planes, but the
inaccuracy is small.*/
for(pli=0;pli<3;pli++)interbits+=pipe.fr[pli].bits<<OC_BIT_SCALE;
interbits+=OC_MINI(_enc->mv_bits[0],_enc->mv_bits[1])<<OC_BIT_SCALE;
interbits+=
_enc->chooser.scheme_bits[_enc->chooser.scheme_list[0]]<<OC_BIT_SCALE;
if(interbits>intrabits)return 1;
}
_enc->ncoded_mbis=ncoded_mbis;
/*Compact the coded fragment list.*/
{
ptrdiff_t ncoded_fragis;
ncoded_fragis=_enc->state.ncoded_fragis[0];
for(pli=1;pli<3;pli++){
memmove(_enc->state.coded_fragis+ncoded_fragis,
_enc->state.coded_fragis+_enc->state.fplanes[pli].froffset,
_enc->state.ncoded_fragis[pli]*sizeof(*_enc->state.coded_fragis));
ncoded_fragis+=_enc->state.ncoded_fragis[pli];
}
_enc->state.ntotal_coded_fragis=ncoded_fragis;
}
return 0;
}
#if defined(OC_COLLECT_METRICS)
# include <stdio.h>
# include <math.h>
/*TODO: It may be helpful (for block-level quantizers especially) to separate
out the contributions from AC and DC into separate tables.*/
# define OC_ZWEIGHT (0.25)
static void oc_mode_metrics_add(oc_mode_metrics *_metrics,
double _w,int _satd,int _rate,double _rmse){
double rate;
/*Accumulate statistics without the scaling; this lets us change the scale
factor yet still use old data.*/
rate=ldexp(_rate,-OC_BIT_SCALE);
if(_metrics->fragw>0){
double dsatd;
double drate;
double drmse;
double w;
dsatd=_satd-_metrics->satd/_metrics->fragw;
drate=rate-_metrics->rate/_metrics->fragw;
drmse=_rmse-_metrics->rmse/_metrics->fragw;
w=_metrics->fragw*_w/(_metrics->fragw+_w);
_metrics->satd2+=dsatd*dsatd*w;
_metrics->satdrate+=dsatd*drate*w;
_metrics->rate2+=drate*drate*w;
_metrics->satdrmse+=dsatd*drmse*w;
_metrics->rmse2+=drmse*drmse*w;
}
_metrics->fragw+=_w;
_metrics->satd+=_satd*_w;
_metrics->rate+=rate*_w;
_metrics->rmse+=_rmse*_w;
}
static void oc_mode_metrics_merge(oc_mode_metrics *_dst,
const oc_mode_metrics *_src,int _n){
int i;
/*Find a non-empty set of metrics.*/
for(i=0;i<_n&&_src[i].fragw<=0;i++);
if(i>=_n){
memset(_dst,0,sizeof(*_dst));
return;
}
memcpy(_dst,_src+i,sizeof(*_dst));
/*And iterate over the remaining non-empty sets of metrics.*/
for(i++;i<_n;i++)if(_src[i].fragw>0){
double wa;
double wb;
double dsatd;
double drate;
double drmse;
double w;
wa=_dst->fragw;
wb=_src[i].fragw;
dsatd=_src[i].satd/wb-_dst->satd/wa;
drate=_src[i].rate/wb-_dst->rate/wa;
drmse=_src[i].rmse/wb-_dst->rmse/wa;
w=wa*wb/(wa+wb);
_dst->fragw+=_src[i].fragw;
_dst->satd+=_src[i].satd;
_dst->rate+=_src[i].rate;
_dst->rmse+=_src[i].rmse;
_dst->satd2+=_src[i].satd2+dsatd*dsatd*w;
_dst->satdrate+=_src[i].satdrate+dsatd*drate*w;
_dst->rate2+=_src[i].rate2+drate*drate*w;
_dst->satdrmse+=_src[i].satdrmse+dsatd*drmse*w;
_dst->rmse2+=_src[i].rmse2+drmse*drmse*w;
}
}
/*Compile collected SATD/rate/RMSE metrics into a form that's immediately
useful for mode decision.*/
static void oc_enc_mode_metrics_update(oc_enc_ctx *_enc,int _qi){
int pli;
int qti;
oc_restore_fpu(&_enc->state);
/*Convert raw collected data into cleaned up sample points.*/
for(pli=0;pli<3;pli++){
for(qti=0;qti<2;qti++){
double fragw;
int bin0;
int bin1;
int bin;
fragw=0;
bin0=bin1=0;
for(bin=0;bin<OC_SAD_BINS;bin++){
oc_mode_metrics metrics;
OC_MODE_RD[_qi][pli][qti][bin].rate=0;
OC_MODE_RD[_qi][pli][qti][bin].rmse=0;
/*Find some points on either side of the current bin.*/
while((bin1<bin+1||fragw<OC_ZWEIGHT)&&bin1<OC_SAD_BINS-1){
fragw+=OC_MODE_METRICS[_qi][pli][qti][bin1++].fragw;
}
while(bin0+1<bin&&bin0+1<bin1&&
fragw-OC_MODE_METRICS[_qi][pli][qti][bin0].fragw>=OC_ZWEIGHT){
fragw-=OC_MODE_METRICS[_qi][pli][qti][bin0++].fragw;
}
/*Merge statistics and fit lines.*/
oc_mode_metrics_merge(&metrics,
OC_MODE_METRICS[_qi][pli][qti]+bin0,bin1-bin0);
if(metrics.fragw>0&&metrics.satd2>0){
double a;
double b;
double msatd;
double mrate;
double mrmse;
double rate;
double rmse;
msatd=metrics.satd/metrics.fragw;
mrate=metrics.rate/metrics.fragw;
mrmse=metrics.rmse/metrics.fragw;
/*Compute the points on these lines corresponding to the actual bin
value.*/
b=metrics.satdrate/metrics.satd2;
a=mrate-b*msatd;
rate=ldexp(a+b*(bin<<OC_SAD_SHIFT),OC_BIT_SCALE);
OC_MODE_RD[_qi][pli][qti][bin].rate=
(ogg_int16_t)OC_CLAMPI(-32768,(int)(rate+0.5),32767);
b=metrics.satdrmse/metrics.satd2;
a=mrmse-b*msatd;
rmse=ldexp(a+b*(bin<<OC_SAD_SHIFT),OC_RMSE_SCALE);
OC_MODE_RD[_qi][pli][qti][bin].rmse=
(ogg_int16_t)OC_CLAMPI(-32768,(int)(rmse+0.5),32767);
}
}
}
}
}
/*The following token skipping code used to also be used in the decoder (and
even at one point other places in the encoder).
However, it was obsoleted by other optimizations, and is now only used here.
It has been moved here to avoid generating the code when it's not needed.*/
/*Determines the number of blocks or coefficients to be skipped for a given
token value.
_token: The token value to skip.
_extra_bits: The extra bits attached to this token.
Return: A positive value indicates that number of coefficients are to be
skipped in the current block.
Otherwise, the negative of the return value indicates that number of
blocks are to be ended.*/
typedef ptrdiff_t (*oc_token_skip_func)(int _token,int _extra_bits);
/*Handles the simple end of block tokens.*/
static ptrdiff_t oc_token_skip_eob(int _token,int _extra_bits){
int nblocks_adjust;
nblocks_adjust=OC_UNIBBLE_TABLE32(0,1,2,3,7,15,0,0,_token)+1;
return -_extra_bits-nblocks_adjust;
}
/*The last EOB token has a special case, where an EOB run of size zero ends all
the remaining blocks in the frame.*/
static ptrdiff_t oc_token_skip_eob6(int _token,int _extra_bits){
/*Note: We want to return -PTRDIFF_MAX, but that requires C99, which is not
yet available everywhere; this should be equivalent.*/
if(!_extra_bits)return -(~(size_t)0>>1);
return -_extra_bits;
}
/*Handles the pure zero run tokens.*/
static ptrdiff_t oc_token_skip_zrl(int _token,int _extra_bits){
return _extra_bits+1;
}
/*Handles a normal coefficient value token.*/
static ptrdiff_t oc_token_skip_val(void){
return 1;
}
/*Handles a category 1A zero run/coefficient value combo token.*/
static ptrdiff_t oc_token_skip_run_cat1a(int _token){
return _token-OC_DCT_RUN_CAT1A+2;
}
/*Handles category 1b, 1c, 2a, and 2b zero run/coefficient value combo tokens.*/
static ptrdiff_t oc_token_skip_run(int _token,int _extra_bits){
int run_cati;
int ncoeffs_mask;
int ncoeffs_adjust;
run_cati=_token-OC_DCT_RUN_CAT1B;
ncoeffs_mask=OC_BYTE_TABLE32(3,7,0,1,run_cati);
ncoeffs_adjust=OC_BYTE_TABLE32(7,11,2,3,run_cati);
return (_extra_bits&ncoeffs_mask)+ncoeffs_adjust;
}
/*A jump table for computing the number of coefficients or blocks to skip for
a given token value.
This reduces all the conditional branches, etc., needed to parse these token
values down to one indirect jump.*/
static const oc_token_skip_func OC_TOKEN_SKIP_TABLE[TH_NDCT_TOKENS]={
oc_token_skip_eob,
oc_token_skip_eob,
oc_token_skip_eob,
oc_token_skip_eob,
oc_token_skip_eob,
oc_token_skip_eob,
oc_token_skip_eob6,
oc_token_skip_zrl,
oc_token_skip_zrl,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_val,
(oc_token_skip_func)oc_token_skip_run_cat1a,
(oc_token_skip_func)oc_token_skip_run_cat1a,
(oc_token_skip_func)oc_token_skip_run_cat1a,
(oc_token_skip_func)oc_token_skip_run_cat1a,
(oc_token_skip_func)oc_token_skip_run_cat1a,
oc_token_skip_run,
oc_token_skip_run,
oc_token_skip_run,
oc_token_skip_run
};
/*Determines the number of blocks or coefficients to be skipped for a given
token value.
_token: The token value to skip.
_extra_bits: The extra bits attached to this token.
Return: A positive value indicates that number of coefficients are to be
skipped in the current block.
Otherwise, the negative of the return value indicates that number of
blocks are to be ended.
0 will never be returned, so that at least one coefficient in one
block will always be decoded for every token.*/
static ptrdiff_t oc_dct_token_skip(int _token,int _extra_bits){
return (*OC_TOKEN_SKIP_TABLE[_token])(_token,_extra_bits);
}
void oc_enc_mode_metrics_collect(oc_enc_ctx *_enc){
static const unsigned char OC_ZZI_HUFF_OFFSET[64]={
0,16,16,16,16,16,32,32,
32,32,32,32,32,32,32,48,
48,48,48,48,48,48,48,48,
48,48,48,48,64,64,64,64,
64,64,64,64,64,64,64,64,
64,64,64,64,64,64,64,64,
64,64,64,64,64,64,64,64
};
const oc_fragment *frags;
const unsigned *frag_satd;
const unsigned *frag_ssd;
const ptrdiff_t *coded_fragis;
ptrdiff_t ncoded_fragis;
ptrdiff_t fragii;
double fragw;
int qti;
int qii;
int qi;
int pli;
int zzi;
int token;
int eb;
oc_restore_fpu(&_enc->state);
/*Load any existing mode metrics if we haven't already.*/
if(!oc_has_mode_metrics){
FILE *fmetrics;
memset(OC_MODE_METRICS,0,sizeof(OC_MODE_METRICS));
fmetrics=fopen("modedec.stats","rb");
if(fmetrics!=NULL){
fread(OC_MODE_METRICS,sizeof(OC_MODE_METRICS),1,fmetrics);
fclose(fmetrics);
}
for(qi=0;qi<64;qi++)oc_enc_mode_metrics_update(_enc,qi);
oc_has_mode_metrics=1;
}
qti=_enc->state.frame_type;
frags=_enc->state.frags;
frag_satd=_enc->frag_satd;
frag_ssd=_enc->frag_ssd;
coded_fragis=_enc->state.coded_fragis;
ncoded_fragis=fragii=0;
/*Weight the fragments by the inverse frame size; this prevents HD content
from dominating the statistics.*/
fragw=1.0/_enc->state.nfrags;
for(pli=0;pli<3;pli++){
ptrdiff_t ti[64];
int eob_token[64];
int eob_run[64];
/*Set up token indices and eob run counts.
We don't bother trying to figure out the real cost of the runs that span
coefficients; instead we use the costs that were available when R-D
token optimization was done.*/
for(zzi=0;zzi<64;zzi++){
ti[zzi]=_enc->dct_token_offs[pli][zzi];
if(ti[zzi]>0){
token=_enc->dct_tokens[pli][zzi][0];
eb=_enc->extra_bits[pli][zzi][0];
eob_token[zzi]=token;
eob_run[zzi]=-oc_dct_token_skip(token,eb);
}
else{
eob_token[zzi]=OC_NDCT_EOB_TOKEN_MAX;
eob_run[zzi]=0;
}
}
/*Scan the list of coded fragments for this plane.*/
ncoded_fragis+=_enc->state.ncoded_fragis[pli];
for(;fragii<ncoded_fragis;fragii++){
ptrdiff_t fragi;
ogg_uint32_t frag_bits;
int huffi;
int skip;
int mb_mode;
unsigned satd;
int bin;
fragi=coded_fragis[fragii];
frag_bits=0;
for(zzi=0;zzi<64;){
if(eob_run[zzi]>0){
/*We've reached the end of the block.*/
eob_run[zzi]--;
break;
}
huffi=_enc->huff_idxs[qti][zzi>0][pli+1>>1]
+OC_ZZI_HUFF_OFFSET[zzi];
if(eob_token[zzi]<OC_NDCT_EOB_TOKEN_MAX){
/*This token caused an EOB run to be flushed.
Therefore it gets the bits associated with it.*/
frag_bits+=_enc->huff_codes[huffi][eob_token[zzi]].nbits
+OC_DCT_TOKEN_EXTRA_BITS[eob_token[zzi]];
eob_token[zzi]=OC_NDCT_EOB_TOKEN_MAX;
}
token=_enc->dct_tokens[pli][zzi][ti[zzi]];
eb=_enc->extra_bits[pli][zzi][ti[zzi]];
ti[zzi]++;
skip=oc_dct_token_skip(token,eb);
if(skip<0){
eob_token[zzi]=token;
eob_run[zzi]=-skip;
}
else{
/*A regular DCT value token; accumulate the bits for it.*/
frag_bits+=_enc->huff_codes[huffi][token].nbits
+OC_DCT_TOKEN_EXTRA_BITS[token];
zzi+=skip;
}
}
mb_mode=frags[fragi].mb_mode;
qi=_enc->state.qis[frags[fragi].qii];
satd=frag_satd[fragi]<<(pli+1&2);
bin=OC_MINI(satd>>OC_SAD_SHIFT,OC_SAD_BINS-1);
oc_mode_metrics_add(OC_MODE_METRICS[qi][pli][mb_mode!=OC_MODE_INTRA]+bin,
fragw,satd,frag_bits<<OC_BIT_SCALE,sqrt(frag_ssd[fragi]));
}
}
/*Update global SATD/rate/RMSE estimation matrix.*/
for(qii=0;qii<_enc->state.nqis;qii++){
oc_enc_mode_metrics_update(_enc,_enc->state.qis[qii]);
}
}
void oc_enc_mode_metrics_dump(oc_enc_ctx *_enc){
FILE *fmetrics;
int qi;
/*Generate sample points for complete list of QI values.*/
for(qi=0;qi<64;qi++)oc_enc_mode_metrics_update(_enc,qi);
fmetrics=fopen("modedec.stats","wb");
if(fmetrics!=NULL){
fwrite(OC_MODE_METRICS,sizeof(OC_MODE_METRICS),1,fmetrics);
fclose(fmetrics);
}
fprintf(stdout,
"/*File generated by libtheora with OC_COLLECT_METRICS"
" defined at compile time.*/\n"
"#if !defined(_modedec_H)\n"
"# define _modedec_H (1)\n"
"\n"
"\n"
"\n"
"# if defined(OC_COLLECT_METRICS)\n"
"typedef struct oc_mode_metrics oc_mode_metrics;\n"
"# endif\n"
"typedef struct oc_mode_rd oc_mode_rd;\n"
"\n"
"\n"
"\n"
"/*The number of extra bits of precision at which to store rate"
" metrics.*/\n"
"# define OC_BIT_SCALE (%i)\n"
"/*The number of extra bits of precision at which to store RMSE metrics.\n"
" This must be at least half OC_BIT_SCALE (rounded up).*/\n"
"# define OC_RMSE_SCALE (%i)\n"
"/*The number of bins to partition statistics into.*/\n"
"# define OC_SAD_BINS (%i)\n"
"/*The number of bits of precision to drop"
" from SAD scores to assign them to a\n"
" bin.*/\n"
"# define OC_SAD_SHIFT (%i)\n"
"\n"
"\n"
"\n"
"# if defined(OC_COLLECT_METRICS)\n"
"struct oc_mode_metrics{\n"
" double fragw;\n"
" double satd;\n"
" double rate;\n"
" double rmse;\n"
" double satd2;\n"
" double satdrate;\n"
" double rate2;\n"
" double satdrmse;\n"
" double rmse2;\n"
"};\n"
"\n"
"\n"
"int oc_has_mode_metrics;\n"
"oc_mode_metrics OC_MODE_METRICS[64][3][2][OC_SAD_BINS];\n"
"# endif\n"
"\n"
"\n"
"\n"
"struct oc_mode_rd{\n"
" ogg_int16_t rate;\n"
" ogg_int16_t rmse;\n"
"};\n"
"\n"
"\n"
"# if !defined(OC_COLLECT_METRICS)\n"
"static const\n"
"# endif\n"
"oc_mode_rd OC_MODE_RD[64][3][2][OC_SAD_BINS]={\n",
OC_BIT_SCALE,OC_RMSE_SCALE,OC_SAD_BINS,OC_SAD_SHIFT);
for(qi=0;qi<64;qi++){
int pli;
fprintf(stdout," {\n");
for(pli=0;pli<3;pli++){
int qti;
fprintf(stdout," {\n");
for(qti=0;qti<2;qti++){
int bin;
static const char *pl_names[3]={"Y'","Cb","Cr"};
static const char *qti_names[2]={"INTRA","INTER"};
fprintf(stdout," /*%s qi=%i %s*/\n",
pl_names[pli],qi,qti_names[qti]);
fprintf(stdout," {\n");
fprintf(stdout," ");
for(bin=0;bin<OC_SAD_BINS;bin++){
if(bin&&!(bin&0x3))fprintf(stdout,"\n ");
fprintf(stdout,"{%5i,%5i}",
OC_MODE_RD[qi][pli][qti][bin].rate,
OC_MODE_RD[qi][pli][qti][bin].rmse);
if(bin+1<OC_SAD_BINS)fprintf(stdout,",");
}
fprintf(stdout,"\n }");
if(qti<1)fprintf(stdout,",");
fprintf(stdout,"\n");
}
fprintf(stdout," }");
if(pli<2)fprintf(stdout,",");
fprintf(stdout,"\n");
}
fprintf(stdout," }");
if(qi<63)fprintf(stdout,",");
fprintf(stdout,"\n");
}
fprintf(stdout,
"};\n"
"\n"
"#endif\n");
}
#endif
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