246 lines
6.4 KiB
C
246 lines
6.4 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 "vp8/common/blockd.h"
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#include "onyxd_int.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vpx_ports/mem.h"
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#include "detokenize.h"
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void vp8_reset_mb_tokens_context(MACROBLOCKD *x)
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{
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ENTROPY_CONTEXT *a_ctx = ((ENTROPY_CONTEXT *)x->above_context);
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ENTROPY_CONTEXT *l_ctx = ((ENTROPY_CONTEXT *)x->left_context);
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memset(a_ctx, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
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memset(l_ctx, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
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/* Clear entropy contexts for Y2 blocks */
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if (!x->mode_info_context->mbmi.is_4x4)
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{
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a_ctx[8] = l_ctx[8] = 0;
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}
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}
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/*
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------------------------------------------------------------------------------
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Residual decoding (Paragraph 13.2 / 13.3)
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*/
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static const uint8_t kBands[16 + 1] = {
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0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7,
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0 /* extra entry as sentinel */
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};
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static const uint8_t kCat3[] = { 173, 148, 140, 0 };
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static const uint8_t kCat4[] = { 176, 155, 140, 135, 0 };
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static const uint8_t kCat5[] = { 180, 157, 141, 134, 130, 0 };
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static const uint8_t kCat6[] =
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{ 254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0 };
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static const uint8_t* const kCat3456[] = { kCat3, kCat4, kCat5, kCat6 };
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static const uint8_t kZigzag[16] = {
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0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
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};
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#define VP8GetBit vp8dx_decode_bool
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#define NUM_PROBAS 11
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#define NUM_CTX 3
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/* for const-casting */
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typedef const uint8_t (*ProbaArray)[NUM_CTX][NUM_PROBAS];
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static int GetSigned(BOOL_DECODER *br, int value_to_sign)
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{
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int split = (br->range + 1) >> 1;
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VP8_BD_VALUE bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8);
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int v;
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if(br->count < 0)
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vp8dx_bool_decoder_fill(br);
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if ( br->value < bigsplit )
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{
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br->range = split;
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v= value_to_sign;
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}
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else
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{
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br->range = br->range-split;
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br->value = br->value-bigsplit;
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v = -value_to_sign;
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}
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br->range +=br->range;
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br->value +=br->value;
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br->count--;
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return v;
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}
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/*
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Returns the position of the last non-zero coeff plus one
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(and 0 if there's no coeff at all)
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*/
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static int GetCoeffs(BOOL_DECODER *br, ProbaArray prob,
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int ctx, int n, int16_t* out)
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{
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const uint8_t* p = prob[n][ctx];
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if (!VP8GetBit(br, p[0]))
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{ /* first EOB is more a 'CBP' bit. */
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return 0;
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}
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while (1)
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{
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++n;
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if (!VP8GetBit(br, p[1]))
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{
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p = prob[kBands[n]][0];
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}
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else
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{ /* non zero coeff */
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int v, j;
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if (!VP8GetBit(br, p[2]))
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{
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p = prob[kBands[n]][1];
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v = 1;
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}
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else
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{
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if (!VP8GetBit(br, p[3]))
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{
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if (!VP8GetBit(br, p[4]))
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{
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v = 2;
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}
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else
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{
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v = 3 + VP8GetBit(br, p[5]);
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}
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}
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else
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{
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if (!VP8GetBit(br, p[6]))
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{
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if (!VP8GetBit(br, p[7]))
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{
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v = 5 + VP8GetBit(br, 159);
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} else
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{
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v = 7 + 2 * VP8GetBit(br, 165);
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v += VP8GetBit(br, 145);
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}
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}
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else
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{
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const uint8_t* tab;
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const int bit1 = VP8GetBit(br, p[8]);
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const int bit0 = VP8GetBit(br, p[9 + bit1]);
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const int cat = 2 * bit1 + bit0;
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v = 0;
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for (tab = kCat3456[cat]; *tab; ++tab)
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{
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v += v + VP8GetBit(br, *tab);
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}
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v += 3 + (8 << cat);
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}
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}
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p = prob[kBands[n]][2];
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}
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j = kZigzag[n - 1];
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out[j] = GetSigned(br, v);
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if (n == 16 || !VP8GetBit(br, p[0]))
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{ /* EOB */
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return n;
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}
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}
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if (n == 16)
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{
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return 16;
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}
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}
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}
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int vp8_decode_mb_tokens(VP8D_COMP *dx, MACROBLOCKD *x)
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{
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BOOL_DECODER *bc = x->current_bc;
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const FRAME_CONTEXT * const fc = &dx->common.fc;
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char *eobs = x->eobs;
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int i;
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int nonzeros;
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int eobtotal = 0;
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short *qcoeff_ptr;
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ProbaArray coef_probs;
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ENTROPY_CONTEXT *a_ctx = ((ENTROPY_CONTEXT *)x->above_context);
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ENTROPY_CONTEXT *l_ctx = ((ENTROPY_CONTEXT *)x->left_context);
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ENTROPY_CONTEXT *a;
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ENTROPY_CONTEXT *l;
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int skip_dc = 0;
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qcoeff_ptr = &x->qcoeff[0];
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if (!x->mode_info_context->mbmi.is_4x4)
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{
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a = a_ctx + 8;
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l = l_ctx + 8;
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coef_probs = fc->coef_probs [1];
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nonzeros = GetCoeffs(bc, coef_probs, (*a + *l), 0, qcoeff_ptr + 24 * 16);
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*a = *l = (nonzeros > 0);
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eobs[24] = nonzeros;
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eobtotal += nonzeros - 16;
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coef_probs = fc->coef_probs [0];
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skip_dc = 1;
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}
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else
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{
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coef_probs = fc->coef_probs [3];
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skip_dc = 0;
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}
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for (i = 0; i < 16; ++i)
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{
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a = a_ctx + (i&3);
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l = l_ctx + ((i&0xc)>>2);
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nonzeros = GetCoeffs(bc, coef_probs, (*a + *l), skip_dc, qcoeff_ptr);
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*a = *l = (nonzeros > 0);
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nonzeros += skip_dc;
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eobs[i] = nonzeros;
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eobtotal += nonzeros;
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qcoeff_ptr += 16;
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}
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coef_probs = fc->coef_probs [2];
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a_ctx += 4;
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l_ctx += 4;
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for (i = 16; i < 24; ++i)
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{
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a = a_ctx + ((i > 19)<<1) + (i&1);
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l = l_ctx + ((i > 19)<<1) + ((i&3)>1);
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nonzeros = GetCoeffs(bc, coef_probs, (*a + *l), 0, qcoeff_ptr);
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*a = *l = (nonzeros > 0);
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eobs[i] = nonzeros;
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eobtotal += nonzeros;
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qcoeff_ptr += 16;
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}
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return eobtotal;
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}
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