shithub: libvpx

ref: a1fdfbb174487e5efb76e6e77119d2e50840086e
dir: /vpx_dsp/x86/quantize_sse2.c/

/*
 *  Copyright (c) 2015 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 <assert.h>
#include <emmintrin.h>
#include <xmmintrin.h>

#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/x86/bitdepth_conversion_sse2.h"
#include "vpx_dsp/x86/quantize_sse2.h"

void vpx_quantize_b_sse2(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
                         int skip_block, const int16_t *zbin_ptr,
                         const int16_t *round_ptr, const int16_t *quant_ptr,
                         const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr,
                         tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr,
                         uint16_t *eob_ptr, const int16_t *scan,
                         const int16_t *iscan) {
  const __m128i zero = _mm_setzero_si128();
  int index = 16;

  __m128i zbin, round, quant, dequant, shift;
  __m128i coeff0, coeff1, coeff0_sign, coeff1_sign;
  __m128i qcoeff0, qcoeff1;
  __m128i cmp_mask0, cmp_mask1;
  __m128i eob, eob0;

  (void)scan;
  (void)skip_block;
  assert(!skip_block);

  // Setup global values.
  load_b_values(zbin_ptr, &zbin, round_ptr, &round, quant_ptr, &quant,
                dequant_ptr, &dequant, quant_shift_ptr, &shift);

  // Do DC and first 15 AC.
  coeff0 = load_tran_low(coeff_ptr);
  coeff1 = load_tran_low(coeff_ptr + 8);

  // Poor man's abs().
  coeff0_sign = _mm_srai_epi16(coeff0, 15);
  coeff1_sign = _mm_srai_epi16(coeff1, 15);
  qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);
  qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);
  zbin = _mm_unpackhi_epi64(zbin, zbin);  // Switch DC to AC
  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  calculate_qcoeff(&qcoeff0, round, quant, shift);

  round = _mm_unpackhi_epi64(round, round);
  quant = _mm_unpackhi_epi64(quant, quant);
  shift = _mm_unpackhi_epi64(shift, shift);

  calculate_qcoeff(&qcoeff1, round, quant, shift);

  // Reinsert signs
  qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);
  qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

  // Mask out zbin threshold coeffs
  qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
  qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

  store_tran_low(qcoeff0, qcoeff_ptr);
  store_tran_low(qcoeff1, qcoeff_ptr + 8);

  calculate_dqcoeff_and_store(qcoeff0, dequant, dqcoeff_ptr);
  dequant = _mm_unpackhi_epi64(dequant, dequant);
  calculate_dqcoeff_and_store(qcoeff1, dequant, dqcoeff_ptr + 8);

  eob = scan_for_eob(&qcoeff0, &qcoeff1, cmp_mask0, cmp_mask1, iscan, 0, zero);

  // AC only loop.
  while (index < n_coeffs) {
    coeff0 = load_tran_low(coeff_ptr + index);
    coeff1 = load_tran_low(coeff_ptr + index + 8);

    coeff0_sign = _mm_srai_epi16(coeff0, 15);
    coeff1_sign = _mm_srai_epi16(coeff1, 15);
    qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);
    qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);
    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    calculate_qcoeff(&qcoeff0, round, quant, shift);
    calculate_qcoeff(&qcoeff1, round, quant, shift);

    qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);
    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_tran_low(qcoeff0, qcoeff_ptr + index);
    store_tran_low(qcoeff1, qcoeff_ptr + index + 8);

    calculate_dqcoeff_and_store(qcoeff0, dequant, dqcoeff_ptr + index);
    calculate_dqcoeff_and_store(qcoeff1, dequant, dqcoeff_ptr + index + 8);

    eob0 = scan_for_eob(&qcoeff0, &qcoeff1, cmp_mask0, cmp_mask1, iscan, index,
                        zero);
    eob = _mm_max_epi16(eob, eob0);

    index += 16;
  }

  *eob_ptr = accumulate_eob(eob);
}