| /* |
| * 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 "vp8/common/common.h" |
| #include "encodemv.h" |
| #include "vp8/common/entropymode.h" |
| #include "vp8/common/systemdependent.h" |
| |
| #include <math.h> |
| |
| #ifdef VP8_ENTROPY_STATS |
| extern unsigned int active_section; |
| #endif |
| |
| static void encode_mvcomponent( |
| vp8_writer *const w, |
| const int v, |
| const struct mv_context *mvc |
| ) |
| { |
| const vp8_prob *p = mvc->prob; |
| const int x = v < 0 ? -v : v; |
| |
| if (x < mvnum_short) /* Small */ |
| { |
| vp8_write(w, 0, p [mvpis_short]); |
| vp8_treed_write(w, vp8_small_mvtree, p + MVPshort, x, 3); |
| |
| if (!x) |
| return; /* no sign bit */ |
| } |
| else /* Large */ |
| { |
| int i = 0; |
| |
| vp8_write(w, 1, p [mvpis_short]); |
| |
| do |
| vp8_write(w, (x >> i) & 1, p [MVPbits + i]); |
| |
| while (++i < 3); |
| |
| i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */ |
| |
| do |
| vp8_write(w, (x >> i) & 1, p [MVPbits + i]); |
| |
| while (--i > 3); |
| |
| if (x & 0xFFF0) |
| vp8_write(w, (x >> 3) & 1, p [MVPbits + 3]); |
| } |
| |
| vp8_write(w, v < 0, p [MVPsign]); |
| } |
| #if 0 |
| static int max_mv_r = 0; |
| static int max_mv_c = 0; |
| #endif |
| void vp8_encode_motion_vector(vp8_writer *w, const MV *mv, const MV_CONTEXT *mvc) |
| { |
| |
| #if 0 |
| { |
| if (abs(mv->row >> 1) > max_mv_r) |
| { |
| FILE *f = fopen("maxmv.stt", "a"); |
| max_mv_r = abs(mv->row >> 1); |
| fprintf(f, "New Mv Row Max %6d\n", (mv->row >> 1)); |
| |
| if ((abs(mv->row) / 2) != max_mv_r) |
| fprintf(f, "MV Row conversion error %6d\n", abs(mv->row) / 2); |
| |
| fclose(f); |
| } |
| |
| if (abs(mv->col >> 1) > max_mv_c) |
| { |
| FILE *f = fopen("maxmv.stt", "a"); |
| fprintf(f, "New Mv Col Max %6d\n", (mv->col >> 1)); |
| max_mv_c = abs(mv->col >> 1); |
| fclose(f); |
| } |
| } |
| #endif |
| |
| encode_mvcomponent(w, mv->row >> 1, &mvc[0]); |
| encode_mvcomponent(w, mv->col >> 1, &mvc[1]); |
| } |
| |
| |
| static unsigned int cost_mvcomponent(const int v, const struct mv_context *mvc) |
| { |
| const vp8_prob *p = mvc->prob; |
| const int x = v; |
| unsigned int cost; |
| |
| if (x < mvnum_short) |
| { |
| cost = vp8_cost_zero(p [mvpis_short]) |
| + vp8_treed_cost(vp8_small_mvtree, p + MVPshort, x, 3); |
| |
| if (!x) |
| return cost; |
| } |
| else |
| { |
| int i = 0; |
| cost = vp8_cost_one(p [mvpis_short]); |
| |
| do |
| cost += vp8_cost_bit(p [MVPbits + i], (x >> i) & 1); |
| |
| while (++i < 3); |
| |
| i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */ |
| |
| do |
| cost += vp8_cost_bit(p [MVPbits + i], (x >> i) & 1); |
| |
| while (--i > 3); |
| |
| if (x & 0xFFF0) |
| cost += vp8_cost_bit(p [MVPbits + 3], (x >> 3) & 1); |
| } |
| |
| return cost; /* + vp8_cost_bit( p [MVPsign], v < 0); */ |
| } |
| |
| void vp8_build_component_cost_table(int *mvcost[2], const MV_CONTEXT *mvc, int mvc_flag[2]) |
| { |
| int i = 1; |
| unsigned int cost0 = 0; |
| unsigned int cost1 = 0; |
| |
| vp8_clear_system_state(); |
| |
| i = 1; |
| |
| if (mvc_flag[0]) |
| { |
| mvcost [0] [0] = cost_mvcomponent(0, &mvc[0]); |
| |
| do |
| { |
| cost0 = cost_mvcomponent(i, &mvc[0]); |
| |
| mvcost [0] [i] = cost0 + vp8_cost_zero(mvc[0].prob[MVPsign]); |
| mvcost [0] [-i] = cost0 + vp8_cost_one(mvc[0].prob[MVPsign]); |
| } |
| while (++i <= mv_max); |
| } |
| |
| i = 1; |
| |
| if (mvc_flag[1]) |
| { |
| mvcost [1] [0] = cost_mvcomponent(0, &mvc[1]); |
| |
| do |
| { |
| cost1 = cost_mvcomponent(i, &mvc[1]); |
| |
| mvcost [1] [i] = cost1 + vp8_cost_zero(mvc[1].prob[MVPsign]); |
| mvcost [1] [-i] = cost1 + vp8_cost_one(mvc[1].prob[MVPsign]); |
| } |
| while (++i <= mv_max); |
| } |
| } |
| |
| |
| /* Motion vector probability table update depends on benefit. |
| * Small correction allows for the fact that an update to an MV probability |
| * may have benefit in subsequent frames as well as the current one. |
| */ |
| #define MV_PROB_UPDATE_CORRECTION -1 |
| |
| |
| static void calc_prob(vp8_prob *p, const unsigned int ct[2]) |
| { |
| const unsigned int tot = ct[0] + ct[1]; |
| |
| if (tot) |
| { |
| const vp8_prob x = ((ct[0] * 255) / tot) & -2; |
| *p = x ? x : 1; |
| } |
| } |
| |
| static void update( |
| vp8_writer *const w, |
| const unsigned int ct[2], |
| vp8_prob *const cur_p, |
| const vp8_prob new_p, |
| const vp8_prob update_p, |
| int *updated |
| ) |
| { |
| const int cur_b = vp8_cost_branch(ct, *cur_p); |
| const int new_b = vp8_cost_branch(ct, new_p); |
| const int cost = 7 + MV_PROB_UPDATE_CORRECTION + ((vp8_cost_one(update_p) - vp8_cost_zero(update_p) + 128) >> 8); |
| |
| if (cur_b - new_b > cost) |
| { |
| *cur_p = new_p; |
| vp8_write(w, 1, update_p); |
| vp8_write_literal(w, new_p >> 1, 7); |
| *updated = 1; |
| |
| } |
| else |
| vp8_write(w, 0, update_p); |
| } |
| |
| static void write_component_probs( |
| vp8_writer *const w, |
| struct mv_context *cur_mvc, |
| const struct mv_context *default_mvc_, |
| const struct mv_context *update_mvc, |
| const unsigned int events [MVvals], |
| unsigned int rc, |
| int *updated |
| ) |
| { |
| vp8_prob *Pcur = cur_mvc->prob; |
| const vp8_prob *default_mvc = default_mvc_->prob; |
| const vp8_prob *Pupdate = update_mvc->prob; |
| unsigned int is_short_ct[2], sign_ct[2]; |
| |
| unsigned int bit_ct [mvlong_width] [2]; |
| |
| unsigned int short_ct [mvnum_short]; |
| unsigned int short_bct [mvnum_short-1] [2]; |
| |
| vp8_prob Pnew [MVPcount]; |
| |
| (void) rc; |
| vp8_copy_array(Pnew, default_mvc, MVPcount); |
| |
| vp8_zero(is_short_ct) |
| vp8_zero(sign_ct) |
| vp8_zero(bit_ct) |
| vp8_zero(short_ct) |
| vp8_zero(short_bct) |
| |
| |
| /* j=0 */ |
| { |
| const int c = events [mv_max]; |
| |
| is_short_ct [0] += c; /* Short vector */ |
| short_ct [0] += c; /* Magnitude distribution */ |
| } |
| |
| /* j: 1 ~ mv_max (1023) */ |
| { |
| int j = 1; |
| |
| do |
| { |
| const int c1 = events [mv_max + j]; /* positive */ |
| const int c2 = events [mv_max - j]; /* negative */ |
| const int c = c1 + c2; |
| int a = j; |
| |
| sign_ct [0] += c1; |
| sign_ct [1] += c2; |
| |
| if (a < mvnum_short) |
| { |
| is_short_ct [0] += c; /* Short vector */ |
| short_ct [a] += c; /* Magnitude distribution */ |
| } |
| else |
| { |
| int k = mvlong_width - 1; |
| is_short_ct [1] += c; /* Long vector */ |
| |
| /* bit 3 not always encoded. */ |
| do |
| bit_ct [k] [(a >> k) & 1] += c; |
| |
| while (--k >= 0); |
| } |
| } |
| while (++j <= mv_max); |
| } |
| |
| calc_prob(Pnew + mvpis_short, is_short_ct); |
| |
| calc_prob(Pnew + MVPsign, sign_ct); |
| |
| { |
| vp8_prob p [mvnum_short - 1]; /* actually only need branch ct */ |
| int j = 0; |
| |
| vp8_tree_probs_from_distribution( |
| 8, vp8_small_mvencodings, vp8_small_mvtree, |
| p, short_bct, short_ct, |
| 256, 1 |
| ); |
| |
| do |
| calc_prob(Pnew + MVPshort + j, short_bct[j]); |
| |
| while (++j < mvnum_short - 1); |
| } |
| |
| { |
| int j = 0; |
| |
| do |
| calc_prob(Pnew + MVPbits + j, bit_ct[j]); |
| |
| while (++j < mvlong_width); |
| } |
| |
| update(w, is_short_ct, Pcur + mvpis_short, Pnew[mvpis_short], *Pupdate++, updated); |
| |
| update(w, sign_ct, Pcur + MVPsign, Pnew[MVPsign], *Pupdate++, updated); |
| |
| { |
| const vp8_prob *const new_p = Pnew + MVPshort; |
| vp8_prob *const cur_p = Pcur + MVPshort; |
| |
| int j = 0; |
| |
| do |
| |
| update(w, short_bct[j], cur_p + j, new_p[j], *Pupdate++, updated); |
| |
| while (++j < mvnum_short - 1); |
| } |
| |
| { |
| const vp8_prob *const new_p = Pnew + MVPbits; |
| vp8_prob *const cur_p = Pcur + MVPbits; |
| |
| int j = 0; |
| |
| do |
| |
| update(w, bit_ct[j], cur_p + j, new_p[j], *Pupdate++, updated); |
| |
| while (++j < mvlong_width); |
| } |
| } |
| |
| void vp8_write_mvprobs(VP8_COMP *cpi) |
| { |
| vp8_writer *const w = cpi->bc; |
| MV_CONTEXT *mvc = cpi->common.fc.mvc; |
| int flags[2] = {0, 0}; |
| #ifdef VP8_ENTROPY_STATS |
| active_section = 4; |
| #endif |
| write_component_probs( |
| w, &mvc[0], &vp8_default_mv_context[0], &vp8_mv_update_probs[0], |
| cpi->mb.MVcount[0], 0, &flags[0] |
| ); |
| write_component_probs( |
| w, &mvc[1], &vp8_default_mv_context[1], &vp8_mv_update_probs[1], |
| cpi->mb.MVcount[1], 1, &flags[1] |
| ); |
| |
| if (flags[0] || flags[1]) |
| vp8_build_component_cost_table(cpi->mb.mvcost, (const MV_CONTEXT *) cpi->common.fc.mvc, flags); |
| |
| #ifdef VP8_ENTROPY_STATS |
| active_section = 5; |
| #endif |
| } |
