454 lines
11 KiB
C
454 lines
11 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "onyx_int.h"
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#include "tokenize.h"
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#include "vpx_mem/vpx_mem.h"
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/* Global event counters used for accumulating statistics across several
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compressions, then generating context.c = initial stats. */
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#ifdef ENTROPY_STATS
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_int64 context_counters[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [vp8_coef_tokens];
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#endif
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void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t) ;
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void vp8_fix_contexts(MACROBLOCKD *x);
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static TOKENVALUE dct_value_tokens[DCT_MAX_VALUE*2];
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const TOKENVALUE *vp8_dct_value_tokens_ptr;
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static int dct_value_cost[DCT_MAX_VALUE*2];
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const int *vp8_dct_value_cost_ptr;
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#if 0
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int skip_true_count = 0;
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int skip_false_count = 0;
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#endif
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static void fill_value_tokens()
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{
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TOKENVALUE *const t = dct_value_tokens + DCT_MAX_VALUE;
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vp8_extra_bit_struct *const e = vp8_extra_bits;
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int i = -DCT_MAX_VALUE;
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int sign = 1;
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do
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{
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if (!i)
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sign = 0;
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{
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const int a = sign ? -i : i;
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int eb = sign;
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if (a > 4)
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{
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int j = 4;
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while (++j < 11 && e[j].base_val <= a) {}
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t[i].Token = --j;
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eb |= (a - e[j].base_val) << 1;
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}
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else
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t[i].Token = a;
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t[i].Extra = eb;
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}
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// initialize the cost for extra bits for all possible coefficient value.
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{
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int cost = 0;
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vp8_extra_bit_struct *p = vp8_extra_bits + t[i].Token;
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if (p->base_val)
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{
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const int extra = t[i].Extra;
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const int Length = p->Len;
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if (Length)
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cost += vp8_treed_cost(p->tree, p->prob, extra >> 1, Length);
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cost += vp8_cost_bit(vp8_prob_half, extra & 1); /* sign */
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dct_value_cost[i + DCT_MAX_VALUE] = cost;
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}
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}
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}
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while (++i < DCT_MAX_VALUE);
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vp8_dct_value_tokens_ptr = dct_value_tokens + DCT_MAX_VALUE;
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vp8_dct_value_cost_ptr = dct_value_cost + DCT_MAX_VALUE;
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}
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static void tokenize2nd_order_b
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(
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const BLOCKD *const b,
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TOKENEXTRA **tp,
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const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */
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ENTROPY_CONTEXT *a,
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ENTROPY_CONTEXT *l,
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VP8_COMP *cpi
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)
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{
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int pt; /* near block/prev token context index */
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int c = 0; /* start at DC */
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const int eob = b->eob; /* one beyond last nonzero coeff */
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TOKENEXTRA *t = *tp; /* store tokens starting here */
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int x;
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const short *qcoeff_ptr = b->qcoeff;
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VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
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do
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{
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const int band = vp8_coef_bands[c];
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if (c < eob)
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{
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int rc = vp8_default_zig_zag1d[c];
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const int v = qcoeff_ptr[rc];
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#if CONFIG_DEBUG
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assert(-DCT_MAX_VALUE <= v && v < (DCT_MAX_VALUE));
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#endif
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t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
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x = vp8_dct_value_tokens_ptr[v].Token;
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}
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else
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x = DCT_EOB_TOKEN;
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t->Token = x;
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t->context_tree = cpi->common.fc.coef_probs [type] [band] [pt];
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t->skip_eob_node = pt == 0 && ((band > 0 && type > 0) || (band > 1 && type == 0));
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++cpi->coef_counts [type] [band] [pt] [x];
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}
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while (pt = vp8_prev_token_class[x], ++t, c < eob && ++c < 16);
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*tp = t;
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pt = (c != !type); /* 0 <-> all coeff data is zero */
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*a = *l = pt;
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}
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static void tokenize1st_order_b
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(
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const BLOCKD *const b,
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TOKENEXTRA **tp,
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const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */
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ENTROPY_CONTEXT *a,
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ENTROPY_CONTEXT *l,
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VP8_COMP *cpi
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)
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{
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int pt; /* near block/prev token context index */
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int c = type ? 0 : 1; /* start at DC unless type 0 */
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const int eob = b->eob; /* one beyond last nonzero coeff */
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TOKENEXTRA *t = *tp; /* store tokens starting here */
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int x;
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const short *qcoeff_ptr = b->qcoeff;
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VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
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do
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{
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const int band = vp8_coef_bands[c];
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x = DCT_EOB_TOKEN;
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if (c < eob)
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{
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int rc = vp8_default_zig_zag1d[c];
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const int v = qcoeff_ptr[rc];
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#if CONFIG_DEBUG
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assert(-DCT_MAX_VALUE <= v && v < (DCT_MAX_VALUE));
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#endif
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t->Extra = vp8_dct_value_tokens_ptr[v].Extra;
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x = vp8_dct_value_tokens_ptr[v].Token;
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}
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t->Token = x;
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t->context_tree = cpi->common.fc.coef_probs [type] [band] [pt];
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t->skip_eob_node = pt == 0 && ((band > 0 && type > 0) || (band > 1 && type == 0));
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++cpi->coef_counts [type] [band] [pt] [x];
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}
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while (pt = vp8_prev_token_class[x], ++t, c < eob && ++c < 16);
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*tp = t;
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pt = (c != !type); /* 0 <-> all coeff data is zero */
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*a = *l = pt;
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}
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static int mb_is_skippable(MACROBLOCKD *x, int has_y2_block)
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{
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int skip = 1;
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int i = 0;
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if (has_y2_block)
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{
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for (i = 0; i < 16; i++)
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skip &= (x->block[i].eob < 2);
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}
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for (; i < 24 + has_y2_block; i++)
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skip &= (!x->block[i].eob);
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return skip;
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}
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void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t)
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{
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ENTROPY_CONTEXT * A = (ENTROPY_CONTEXT *)x->above_context;
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ENTROPY_CONTEXT * L = (ENTROPY_CONTEXT *)x->left_context;
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int plane_type;
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int b;
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int has_y2_block;
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has_y2_block = (x->mode_info_context->mbmi.mode != B_PRED
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&& x->mode_info_context->mbmi.mode != SPLITMV);
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x->mode_info_context->mbmi.mb_skip_coeff = mb_is_skippable(x, has_y2_block);
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if (x->mode_info_context->mbmi.mb_skip_coeff)
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{
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cpi->skip_true_count++;
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if (!cpi->common.mb_no_coeff_skip)
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vp8_stuff_mb(cpi, x, t) ;
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else
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{
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vp8_fix_contexts(x);
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}
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return;
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}
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cpi->skip_false_count++;
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plane_type = 3;
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if(has_y2_block)
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{
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tokenize2nd_order_b(x->block + 24, t, 1,
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A + vp8_block2above[24], L + vp8_block2left[24], cpi);
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plane_type = 0;
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}
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for (b = 0; b < 16; b++)
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tokenize1st_order_b(x->block + b, t, plane_type,
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A + vp8_block2above[b],
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L + vp8_block2left[b], cpi);
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for (b = 16; b < 24; b++)
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tokenize1st_order_b(x->block + b, t, 2,
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A + vp8_block2above[b],
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L + vp8_block2left[b], cpi);
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}
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#ifdef ENTROPY_STATS
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void init_context_counters(void)
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{
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vpx_memset(context_counters, 0, sizeof(context_counters));
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}
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void print_context_counters()
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{
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int type, band, pt, t;
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FILE *const f = fopen("context.c", "w");
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fprintf(f, "#include \"entropy.h\"\n");
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fprintf(f, "\n/* *** GENERATED FILE: DO NOT EDIT *** */\n\n");
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fprintf(f, "int Contexts[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [vp8_coef_tokens];\n\n");
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fprintf(f, "const int default_contexts[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [vp8_coef_tokens] = {");
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# define Comma( X) (X? ",":"")
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type = 0;
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do
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{
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fprintf(f, "%s\n { /* block Type %d */", Comma(type), type);
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band = 0;
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do
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{
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fprintf(f, "%s\n { /* Coeff Band %d */", Comma(band), band);
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pt = 0;
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do
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{
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fprintf(f, "%s\n {", Comma(pt));
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t = 0;
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do
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{
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const _int64 x = context_counters [type] [band] [pt] [t];
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const int y = (int) x;
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assert(x == (_int64) y); /* no overflow handling yet */
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fprintf(f, "%s %d", Comma(t), y);
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}
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while (++t < vp8_coef_tokens);
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fprintf(f, "}");
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}
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while (++pt < PREV_COEF_CONTEXTS);
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fprintf(f, "\n }");
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}
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while (++band < COEF_BANDS);
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fprintf(f, "\n }");
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}
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while (++type < BLOCK_TYPES);
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fprintf(f, "\n};\n");
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fclose(f);
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}
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#endif
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void vp8_tokenize_initialize()
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{
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fill_value_tokens();
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}
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static __inline void stuff2nd_order_b
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(
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TOKENEXTRA **tp,
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ENTROPY_CONTEXT *a,
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ENTROPY_CONTEXT *l,
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VP8_COMP *cpi
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)
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{
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int pt; /* near block/prev token context index */
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TOKENEXTRA *t = *tp; /* store tokens starting here */
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VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
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t->Token = DCT_EOB_TOKEN;
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t->context_tree = cpi->common.fc.coef_probs [1] [0] [pt];
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t->skip_eob_node = 0;
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++cpi->coef_counts [1] [0] [pt] [DCT_EOB_TOKEN];
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++t;
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*tp = t;
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pt = 0;
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*a = *l = pt;
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}
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static __inline void stuff1st_order_b
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(
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TOKENEXTRA **tp,
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ENTROPY_CONTEXT *a,
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ENTROPY_CONTEXT *l,
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VP8_COMP *cpi
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)
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{
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int pt; /* near block/prev token context index */
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TOKENEXTRA *t = *tp; /* store tokens starting here */
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VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
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t->Token = DCT_EOB_TOKEN;
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t->context_tree = cpi->common.fc.coef_probs [0] [1] [pt];
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t->skip_eob_node = 0;
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++cpi->coef_counts [0] [1] [pt] [DCT_EOB_TOKEN];
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++t;
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*tp = t;
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pt = 0; /* 0 <-> all coeff data is zero */
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*a = *l = pt;
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}
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static __inline
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void stuff1st_order_buv
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(
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TOKENEXTRA **tp,
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ENTROPY_CONTEXT *a,
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ENTROPY_CONTEXT *l,
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VP8_COMP *cpi
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)
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{
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int pt; /* near block/prev token context index */
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TOKENEXTRA *t = *tp; /* store tokens starting here */
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VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
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t->Token = DCT_EOB_TOKEN;
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t->context_tree = cpi->common.fc.coef_probs [2] [0] [pt];
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t->skip_eob_node = 0;
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++cpi->coef_counts[2] [0] [pt] [DCT_EOB_TOKEN];
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++t;
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*tp = t;
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pt = 0; /* 0 <-> all coeff data is zero */
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*a = *l = pt;
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}
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void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t)
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{
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ENTROPY_CONTEXT * A = (ENTROPY_CONTEXT *)x->above_context;
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ENTROPY_CONTEXT * L = (ENTROPY_CONTEXT *)x->left_context;
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int plane_type;
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int b;
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stuff2nd_order_b(t,
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A + vp8_block2above[24], L + vp8_block2left[24], cpi);
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plane_type = 0;
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for (b = 0; b < 16; b++)
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stuff1st_order_b(t,
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A + vp8_block2above[b],
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L + vp8_block2left[b], cpi);
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for (b = 16; b < 24; b++)
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stuff1st_order_buv(t,
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A + vp8_block2above[b],
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L + vp8_block2left[b], cpi);
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}
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void vp8_fix_contexts(MACROBLOCKD *x)
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{
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/* Clear entropy contexts for Y2 blocks */
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if (x->mode_info_context->mbmi.mode != B_PRED && x->mode_info_context->mbmi.mode != SPLITMV)
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{
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vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
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vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
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}
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else
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{
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vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
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vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
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}
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}
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