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vpx/vp9/decoder/vp9_detokenize.c
Paul Wilkins 4305dd4778 Avoid calls to get_coef_band(). 
Use value already computed value to save of calls

Change-Id: I42836698e59c116416ccd75395bebdd11dd609fb
2013-05-10 11:49:54 +01:00

309 lines
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C
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/*
* 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 "vp9/common/vp9_blockd.h"
#include "vp9/common/vp9_common.h"
#include "vp9/decoder/vp9_onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "vp9/decoder/vp9_detokenize.h"
#include "vp9/common/vp9_seg_common.h"
#define EOB_CONTEXT_NODE 0
#define ZERO_CONTEXT_NODE 1
#define ONE_CONTEXT_NODE 2
#define LOW_VAL_CONTEXT_NODE 3
#define TWO_CONTEXT_NODE 4
#define THREE_CONTEXT_NODE 5
#define HIGH_LOW_CONTEXT_NODE 6
#define CAT_ONE_CONTEXT_NODE 7
#define CAT_THREEFOUR_CONTEXT_NODE 8
#define CAT_THREE_CONTEXT_NODE 9
#define CAT_FIVE_CONTEXT_NODE 10
#define CAT1_MIN_VAL 5
#define CAT2_MIN_VAL 7
#define CAT3_MIN_VAL 11
#define CAT4_MIN_VAL 19
#define CAT5_MIN_VAL 35
#define CAT6_MIN_VAL 67
#define CAT1_PROB0 159
#define CAT2_PROB0 145
#define CAT2_PROB1 165
#define CAT3_PROB0 140
#define CAT3_PROB1 148
#define CAT3_PROB2 173
#define CAT4_PROB0 135
#define CAT4_PROB1 140
#define CAT4_PROB2 155
#define CAT4_PROB3 176
#define CAT5_PROB0 130
#define CAT5_PROB1 134
#define CAT5_PROB2 141
#define CAT5_PROB3 157
#define CAT5_PROB4 180
static const vp9_prob cat6_prob[15] = {
254, 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0
};
DECLARE_ALIGNED(16, extern const uint8_t, vp9_norm[256]);
#define INCREMENT_COUNT(token) \
do { \
coef_counts[type][ref][band] \
[pt][token]++; \
token_cache[scan[c]] = token; \
} while (0)
#define WRITE_COEF_CONTINUE(val, token) \
{ \
qcoeff_ptr[scan[c]] = vp9_read_and_apply_sign(r, val) * \
dq[c > 0] / (1 + (txfm_size == TX_32X32)); \
INCREMENT_COUNT(token); \
c++; \
continue; \
}
#define WRITE_COEF_ONE() \
{ \
qcoeff_ptr[scan[c]] = vp9_read_and_apply_sign(br, 1); \
INCREMENT_COUNT(ONE_TOKEN); \
}
#define ADJUST_COEF(prob, bits_count) \
do { \
if (vp9_read(r, prob)) \
val += 1 << bits_count; \
} while (0);
static int decode_coefs(VP9D_COMP *dx, const MACROBLOCKD *xd,
vp9_reader *r, int block_idx,
PLANE_TYPE type, int seg_eob, int16_t *qcoeff_ptr,
TX_SIZE txfm_size, const int16_t *dq,
ENTROPY_CONTEXT *A, ENTROPY_CONTEXT *L) {
ENTROPY_CONTEXT above_ec, left_ec;
FRAME_CONTEXT *const fc = &dx->common.fc;
int pt, c = 0, pad, default_eob;
int band;
vp9_coeff_probs *coef_probs;
vp9_prob *prob;
vp9_coeff_count *coef_counts;
const int ref = xd->mode_info_context->mbmi.ref_frame != INTRA_FRAME;
TX_TYPE tx_type = DCT_DCT;
const int *scan, *nb;
uint8_t token_cache[1024];
switch (txfm_size) {
default:
case TX_4X4: {
tx_type = (type == PLANE_TYPE_Y_WITH_DC) ?
get_tx_type_4x4(xd, block_idx) : DCT_DCT;
scan = get_scan_4x4(tx_type);
above_ec = A[0] != 0;
left_ec = L[0] != 0;
coef_probs = fc->coef_probs_4x4;
coef_counts = fc->coef_counts_4x4;
default_eob = 16;
break;
}
case TX_8X8: {
const BLOCK_SIZE_TYPE sb_type = xd->mode_info_context->mbmi.sb_type;
const int sz = 1 + b_width_log2(sb_type);
const int x = block_idx & ((1 << sz) - 1);
const int y = block_idx - x;
tx_type = (type == PLANE_TYPE_Y_WITH_DC) ?
get_tx_type_8x8(xd, y + (x >> 1)) : DCT_DCT;
scan = get_scan_8x8(tx_type);
coef_probs = fc->coef_probs_8x8;
coef_counts = fc->coef_counts_8x8;
above_ec = (A[0] + A[1]) != 0;
left_ec = (L[0] + L[1]) != 0;
default_eob = 64;
break;
}
case TX_16X16: {
const BLOCK_SIZE_TYPE sb_type = xd->mode_info_context->mbmi.sb_type;
const int sz = 2 + b_width_log2(sb_type);
const int x = block_idx & ((1 << sz) - 1);
const int y = block_idx - x;
tx_type = (type == PLANE_TYPE_Y_WITH_DC) ?
get_tx_type_16x16(xd, y + (x >> 2)) : DCT_DCT;
scan = get_scan_16x16(tx_type);
coef_probs = fc->coef_probs_16x16;
coef_counts = fc->coef_counts_16x16;
above_ec = (A[0] + A[1] + A[2] + A[3]) != 0;
left_ec = (L[0] + L[1] + L[2] + L[3]) != 0;
default_eob = 256;
break;
}
case TX_32X32:
scan = vp9_default_zig_zag1d_32x32;
coef_probs = fc->coef_probs_32x32;
coef_counts = fc->coef_counts_32x32;
above_ec = (A[0] + A[1] + A[2] + A[3] + A[4] + A[5] + A[6] + A[7]) != 0;
left_ec = (L[0] + L[1] + L[2] + L[3] + L[4] + L[5] + L[6] + L[7]) != 0;
default_eob = 1024;
break;
}
pt = combine_entropy_contexts(above_ec, left_ec);
nb = vp9_get_coef_neighbors_handle(scan, &pad);
while (1) {
int val;
const uint8_t *cat6 = cat6_prob;
if (c >= seg_eob)
break;
if (c)
pt = vp9_get_coef_context(scan, nb, pad, token_cache,
c, default_eob);
band = get_coef_band(scan, txfm_size, c);
prob = coef_probs[type][ref][band][pt];
fc->eob_branch_counts[txfm_size][type][ref][band][pt]++;
if (!vp9_read(r, prob[EOB_CONTEXT_NODE]))
break;
SKIP_START:
if (c >= seg_eob)
break;
if (c)
pt = vp9_get_coef_context(scan, nb, pad, token_cache,
c, default_eob);
band = get_coef_band(scan, txfm_size, c);
prob = coef_probs[type][ref][band][pt];
if (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
INCREMENT_COUNT(ZERO_TOKEN);
++c;
goto SKIP_START;
}
// ONE_CONTEXT_NODE_0_
if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
WRITE_COEF_CONTINUE(1, ONE_TOKEN);
}
// LOW_VAL_CONTEXT_NODE_0_
if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) {
if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) {
WRITE_COEF_CONTINUE(2, TWO_TOKEN);
}
if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) {
WRITE_COEF_CONTINUE(3, THREE_TOKEN);
}
WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
}
// HIGH_LOW_CONTEXT_NODE_0_
if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) {
if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) {
val = CAT1_MIN_VAL;
ADJUST_COEF(CAT1_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY1);
}
val = CAT2_MIN_VAL;
ADJUST_COEF(CAT2_PROB1, 1);
ADJUST_COEF(CAT2_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY2);
}
// CAT_THREEFOUR_CONTEXT_NODE_0_
if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) {
val = CAT3_MIN_VAL;
ADJUST_COEF(CAT3_PROB2, 2);
ADJUST_COEF(CAT3_PROB1, 1);
ADJUST_COEF(CAT3_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY3);
}
val = CAT4_MIN_VAL;
ADJUST_COEF(CAT4_PROB3, 3);
ADJUST_COEF(CAT4_PROB2, 2);
ADJUST_COEF(CAT4_PROB1, 1);
ADJUST_COEF(CAT4_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY4);
}
// CAT_FIVE_CONTEXT_NODE_0_:
if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) {
val = CAT5_MIN_VAL;
ADJUST_COEF(CAT5_PROB4, 4);
ADJUST_COEF(CAT5_PROB3, 3);
ADJUST_COEF(CAT5_PROB2, 2);
ADJUST_COEF(CAT5_PROB1, 1);
ADJUST_COEF(CAT5_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY5);
}
val = 0;
while (*cat6) {
val = (val << 1) | vp9_read(r, *cat6++);
}
val += CAT6_MIN_VAL;
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY6);
}
if (c < seg_eob)
coef_counts[type][ref][band][pt][DCT_EOB_TOKEN]++;
for (pt = 0; pt < (1 << txfm_size); pt++) {
A[pt] = L[pt] = c > 0;
}
return c;
}
static int get_eob(MACROBLOCKD* const xd, int segment_id, int eob_max) {
return vp9_get_segdata(xd, segment_id, SEG_LVL_SKIP) ? 0 : eob_max;
}
struct decode_block_args {
VP9D_COMP *pbi;
MACROBLOCKD *xd;
vp9_reader *r;
int *eobtotal;
};
static void decode_block(int plane, int block,
BLOCK_SIZE_TYPE bsize,
int ss_txfrm_size,
void *argv) {
const struct decode_block_args* const arg = argv;
const int bw = b_width_log2(bsize);
// find the maximum eob for this transform size, adjusted by segment
const int segment_id = arg->xd->mode_info_context->mbmi.segment_id;
const TX_SIZE ss_tx_size = ss_txfrm_size / 2;
const int seg_eob = get_eob(arg->xd, segment_id, 16 << ss_txfrm_size);
int16_t* const qcoeff_base = arg->xd->plane[plane].qcoeff;
const int off = block >> ss_txfrm_size;
const int mod = bw - ss_tx_size - arg->xd->plane[plane].subsampling_x;
const int aoff = (off & ((1 << mod) - 1)) << ss_tx_size;
const int loff = (off >> mod) << ss_tx_size;
const int eob = decode_coefs(arg->pbi, arg->xd, arg->r, block,
arg->xd->plane[plane].plane_type, seg_eob,
BLOCK_OFFSET(qcoeff_base, block, 16),
ss_tx_size, arg->xd->plane[plane].dequant,
arg->xd->plane[plane].above_context + aoff,
arg->xd->plane[plane].left_context + loff);
arg->xd->plane[plane].eobs[block] = eob;
arg->eobtotal[0] += eob;
}
int vp9_decode_tokens(VP9D_COMP* const pbi,
MACROBLOCKD* const xd,
vp9_reader *r,
BLOCK_SIZE_TYPE bsize) {
int eobtotal = 0;
struct decode_block_args args = {pbi, xd, r, &eobtotal};
foreach_transformed_block(xd, bsize, decode_block, &args);
return eobtotal;
}
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