ref: b11a37f5403c64099f0cf69024004caf86c207d9
dir: /vp8/encoder/tokenize.c/
/* * Copyright (c) 2010 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include <math.h> #include <stdio.h> #include <string.h> #include <assert.h> #include "onyx_int.h" #include "tokenize.h" #include "vpx_mem/vpx_mem.h" /* Global event counters used for accumulating statistics across several compressions, then generating context.c = initial stats. */ #ifdef VP8_ENTROPY_STATS _int64 context_counters[BLOCK_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS] [MAX_ENTROPY_TOKENS]; #endif void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t); void vp8_fix_contexts(MACROBLOCKD *x); #include "dct_value_tokens.h" #include "dct_value_cost.h" const TOKENVALUE *const vp8_dct_value_tokens_ptr = dct_value_tokens + DCT_MAX_VALUE; const short *const vp8_dct_value_cost_ptr = dct_value_cost + DCT_MAX_VALUE; #if 0 int skip_true_count = 0; int skip_false_count = 0; #endif /* function used to generate dct_value_tokens and dct_value_cost tables */ /* static void fill_value_tokens() { TOKENVALUE *t = dct_value_tokens + DCT_MAX_VALUE; const vp8_extra_bit_struct *e = vp8_extra_bits; int i = -DCT_MAX_VALUE; int sign = 1; do { if (!i) sign = 0; { const int a = sign ? -i : i; int eb = sign; if (a > 4) { int j = 4; while (++j < 11 && e[j].base_val <= a) {} t[i].Token = --j; eb |= (a - e[j].base_val) << 1; } else t[i].Token = a; t[i].Extra = eb; } // initialize the cost for extra bits for all possible coefficient value. { int cost = 0; const vp8_extra_bit_struct *p = vp8_extra_bits + t[i].Token; if (p->base_val) { const int extra = t[i].Extra; const int Length = p->Len; if (Length) cost += vp8_treed_cost(p->tree, p->prob, extra >> 1, Length); cost += vp8_cost_bit(vp8_prob_half, extra & 1); // sign dct_value_cost[i + DCT_MAX_VALUE] = cost; } } } while (++i < DCT_MAX_VALUE); vp8_dct_value_tokens_ptr = dct_value_tokens + DCT_MAX_VALUE; vp8_dct_value_cost_ptr = dct_value_cost + DCT_MAX_VALUE; } */ static void tokenize2nd_order_b(MACROBLOCK *x, TOKENEXTRA **tp, VP8_COMP *cpi) { MACROBLOCKD *xd = &x->e_mbd; int pt; /* near block/prev token context index */ int c; /* start at DC */ TOKENEXTRA *t = *tp; /* store tokens starting here */ const BLOCKD *b; const short *qcoeff_ptr; ENTROPY_CONTEXT *a; ENTROPY_CONTEXT *l; int band, rc, v, token; int eob; b = xd->block + 24; qcoeff_ptr = b->qcoeff; a = (ENTROPY_CONTEXT *)xd->above_context + 8; l = (ENTROPY_CONTEXT *)xd->left_context + 8; eob = xd->eobs[24]; VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); if (!eob) { /* c = band for this case */ t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[1][0][pt]; t->skip_eob_node = 0; ++x->coef_counts[1][0][pt][DCT_EOB_TOKEN]; t++; *tp = t; *a = *l = 0; return; } v = qcoeff_ptr[0]; t->Extra = vp8_dct_value_tokens_ptr[v].Extra; token = vp8_dct_value_tokens_ptr[v].Token; t->Token = token; t->context_tree = cpi->common.fc.coef_probs[1][0][pt]; t->skip_eob_node = 0; ++x->coef_counts[1][0][pt][token]; pt = vp8_prev_token_class[token]; t++; c = 1; for (; c < eob; ++c) { rc = vp8_default_zig_zag1d[c]; band = vp8_coef_bands[c]; v = qcoeff_ptr[rc]; t->Extra = vp8_dct_value_tokens_ptr[v].Extra; token = vp8_dct_value_tokens_ptr[v].Token; t->Token = token; t->context_tree = cpi->common.fc.coef_probs[1][band][pt]; t->skip_eob_node = ((pt == 0)); ++x->coef_counts[1][band][pt][token]; pt = vp8_prev_token_class[token]; t++; } if (c < 16) { band = vp8_coef_bands[c]; t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[1][band][pt]; t->skip_eob_node = 0; ++x->coef_counts[1][band][pt][DCT_EOB_TOKEN]; t++; } *tp = t; *a = *l = 1; } static void tokenize1st_order_b( MACROBLOCK *x, TOKENEXTRA **tp, int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */ VP8_COMP *cpi) { MACROBLOCKD *xd = &x->e_mbd; unsigned int block; const BLOCKD *b; int pt; /* near block/prev token context index */ int c; int token; TOKENEXTRA *t = *tp; /* store tokens starting here */ const short *qcoeff_ptr; ENTROPY_CONTEXT *a; ENTROPY_CONTEXT *l; int band, rc, v; int tmp1, tmp2; b = xd->block; /* Luma */ for (block = 0; block < 16; block++, b++) { const int eob = *b->eob; tmp1 = vp8_block2above[block]; tmp2 = vp8_block2left[block]; qcoeff_ptr = b->qcoeff; a = (ENTROPY_CONTEXT *)xd->above_context + tmp1; l = (ENTROPY_CONTEXT *)xd->left_context + tmp2; VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); c = type ? 0 : 1; if (c >= eob) { /* c = band for this case */ t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[type][c][pt]; t->skip_eob_node = 0; ++x->coef_counts[type][c][pt][DCT_EOB_TOKEN]; t++; *tp = t; *a = *l = 0; continue; } v = qcoeff_ptr[c]; t->Extra = vp8_dct_value_tokens_ptr[v].Extra; token = vp8_dct_value_tokens_ptr[v].Token; t->Token = token; t->context_tree = cpi->common.fc.coef_probs[type][c][pt]; t->skip_eob_node = 0; ++x->coef_counts[type][c][pt][token]; pt = vp8_prev_token_class[token]; t++; c++; assert(eob <= 16); for (; c < eob; ++c) { rc = vp8_default_zig_zag1d[c]; band = vp8_coef_bands[c]; v = qcoeff_ptr[rc]; t->Extra = vp8_dct_value_tokens_ptr[v].Extra; token = vp8_dct_value_tokens_ptr[v].Token; t->Token = token; t->context_tree = cpi->common.fc.coef_probs[type][band][pt]; t->skip_eob_node = (pt == 0); ++x->coef_counts[type][band][pt][token]; pt = vp8_prev_token_class[token]; t++; } if (c < 16) { band = vp8_coef_bands[c]; t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[type][band][pt]; t->skip_eob_node = 0; ++x->coef_counts[type][band][pt][DCT_EOB_TOKEN]; t++; } *tp = t; *a = *l = 1; } /* Chroma */ for (block = 16; block < 24; block++, b++) { const int eob = *b->eob; tmp1 = vp8_block2above[block]; tmp2 = vp8_block2left[block]; qcoeff_ptr = b->qcoeff; a = (ENTROPY_CONTEXT *)xd->above_context + tmp1; l = (ENTROPY_CONTEXT *)xd->left_context + tmp2; VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); if (!eob) { /* c = band for this case */ t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[2][0][pt]; t->skip_eob_node = 0; ++x->coef_counts[2][0][pt][DCT_EOB_TOKEN]; t++; *tp = t; *a = *l = 0; continue; } v = qcoeff_ptr[0]; t->Extra = vp8_dct_value_tokens_ptr[v].Extra; token = vp8_dct_value_tokens_ptr[v].Token; t->Token = token; t->context_tree = cpi->common.fc.coef_probs[2][0][pt]; t->skip_eob_node = 0; ++x->coef_counts[2][0][pt][token]; pt = vp8_prev_token_class[token]; t++; c = 1; assert(eob <= 16); for (; c < eob; ++c) { rc = vp8_default_zig_zag1d[c]; band = vp8_coef_bands[c]; v = qcoeff_ptr[rc]; t->Extra = vp8_dct_value_tokens_ptr[v].Extra; token = vp8_dct_value_tokens_ptr[v].Token; t->Token = token; t->context_tree = cpi->common.fc.coef_probs[2][band][pt]; t->skip_eob_node = (pt == 0); ++x->coef_counts[2][band][pt][token]; pt = vp8_prev_token_class[token]; t++; } if (c < 16) { band = vp8_coef_bands[c]; t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[2][band][pt]; t->skip_eob_node = 0; ++x->coef_counts[2][band][pt][DCT_EOB_TOKEN]; t++; } *tp = t; *a = *l = 1; } } static int mb_is_skippable(MACROBLOCKD *x, int has_y2_block) { int skip = 1; int i = 0; if (has_y2_block) { for (i = 0; i < 16; ++i) skip &= (x->eobs[i] < 2); } for (; i < 24 + has_y2_block; ++i) skip &= (!x->eobs[i]); return skip; } void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t) { MACROBLOCKD *xd = &x->e_mbd; int plane_type; int has_y2_block; has_y2_block = (xd->mode_info_context->mbmi.mode != B_PRED && xd->mode_info_context->mbmi.mode != SPLITMV); xd->mode_info_context->mbmi.mb_skip_coeff = mb_is_skippable(xd, has_y2_block); if (xd->mode_info_context->mbmi.mb_skip_coeff) { if (!cpi->common.mb_no_coeff_skip) { vp8_stuff_mb(cpi, x, t); } else { vp8_fix_contexts(xd); x->skip_true_count++; } return; } plane_type = 3; if (has_y2_block) { tokenize2nd_order_b(x, t, cpi); plane_type = 0; } tokenize1st_order_b(x, t, plane_type, cpi); } #ifdef VP8_ENTROPY_STATS void init_context_counters(void) { memset(context_counters, 0, sizeof(context_counters)); } void print_context_counters() { int type, band, pt, t; FILE *const f = fopen("context.c", "w"); fprintf(f, "#include \"entropy.h\"\n"); fprintf(f, "\n/* *** GENERATED FILE: DO NOT EDIT *** */\n\n"); fprintf(f, "int Contexts[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] " "[MAX_ENTROPY_TOKENS];\n\n"); fprintf(f, "const int default_contexts[BLOCK_TYPES] [COEF_BANDS] " "[PREV_COEF_CONTEXTS] [MAX_ENTROPY_TOKENS] = {"); #define Comma(X) (X ? "," : "") type = 0; do { fprintf(f, "%s\n { /* block Type %d */", Comma(type), type); band = 0; do { fprintf(f, "%s\n { /* Coeff Band %d */", Comma(band), band); pt = 0; do { fprintf(f, "%s\n {", Comma(pt)); t = 0; do { const _int64 x = context_counters[type][band][pt][t]; const int y = (int)x; assert(x == (_int64)y); /* no overflow handling yet */ fprintf(f, "%s %d", Comma(t), y); } while (++t < MAX_ENTROPY_TOKENS); fprintf(f, "}"); } while (++pt < PREV_COEF_CONTEXTS); fprintf(f, "\n }"); } while (++band < COEF_BANDS); fprintf(f, "\n }"); } while (++type < BLOCK_TYPES); fprintf(f, "\n};\n"); fclose(f); } #endif static void stuff2nd_order_b(TOKENEXTRA **tp, ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l, VP8_COMP *cpi, MACROBLOCK *x) { int pt; /* near block/prev token context index */ TOKENEXTRA *t = *tp; /* store tokens starting here */ VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[1][0][pt]; t->skip_eob_node = 0; ++x->coef_counts[1][0][pt][DCT_EOB_TOKEN]; ++t; *tp = t; pt = 0; *a = *l = pt; } static void stuff1st_order_b(TOKENEXTRA **tp, ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l, int type, VP8_COMP *cpi, MACROBLOCK *x) { int pt; /* near block/prev token context index */ int band; TOKENEXTRA *t = *tp; /* store tokens starting here */ VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); band = type ? 0 : 1; t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[type][band][pt]; t->skip_eob_node = 0; ++x->coef_counts[type][band][pt][DCT_EOB_TOKEN]; ++t; *tp = t; pt = 0; /* 0 <-> all coeff data is zero */ *a = *l = pt; } static void stuff1st_order_buv(TOKENEXTRA **tp, ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l, VP8_COMP *cpi, MACROBLOCK *x) { int pt; /* near block/prev token context index */ TOKENEXTRA *t = *tp; /* store tokens starting here */ VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); t->Token = DCT_EOB_TOKEN; t->context_tree = cpi->common.fc.coef_probs[2][0][pt]; t->skip_eob_node = 0; ++x->coef_counts[2][0][pt][DCT_EOB_TOKEN]; ++t; *tp = t; pt = 0; /* 0 <-> all coeff data is zero */ *a = *l = pt; } void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t) { MACROBLOCKD *xd = &x->e_mbd; ENTROPY_CONTEXT *A = (ENTROPY_CONTEXT *)xd->above_context; ENTROPY_CONTEXT *L = (ENTROPY_CONTEXT *)xd->left_context; int plane_type; int b; plane_type = 3; if ((xd->mode_info_context->mbmi.mode != B_PRED && xd->mode_info_context->mbmi.mode != SPLITMV)) { stuff2nd_order_b(t, A + vp8_block2above[24], L + vp8_block2left[24], cpi, x); plane_type = 0; } for (b = 0; b < 16; ++b) { stuff1st_order_b(t, A + vp8_block2above[b], L + vp8_block2left[b], plane_type, cpi, x); } for (b = 16; b < 24; ++b) { stuff1st_order_buv(t, A + vp8_block2above[b], L + vp8_block2left[b], cpi, x); } } void vp8_fix_contexts(MACROBLOCKD *x) { /* Clear entropy contexts for Y2 blocks */ if (x->mode_info_context->mbmi.mode != B_PRED && x->mode_info_context->mbmi.mode != SPLITMV) { memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)); memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)); } else { memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) - 1); memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) - 1); } }