mirror of https://git.ffmpeg.org/ffmpeg.git
372 lines
11 KiB
C
372 lines
11 KiB
C
/*
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* Simple IDCT
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*
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* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* simpleidct in C.
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*/
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/* Based upon some commented-out C code from mpeg2dec (idct_mmx.c
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* written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>). */
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#include "simple_idct.h"
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#include "bit_depth_template.c"
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#undef W1
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#undef W2
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#undef W3
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#undef W4
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#undef W5
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#undef W6
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#undef W7
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#undef ROW_SHIFT
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#undef COL_SHIFT
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#undef DC_SHIFT
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#undef MUL
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#undef MAC
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#if BIT_DEPTH == 8
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#define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
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#define ROW_SHIFT 11
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#define COL_SHIFT 20
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#define DC_SHIFT 3
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#define MUL(a, b) MUL16(a, b)
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#define MAC(a, b, c) MAC16(a, b, c)
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#elif BIT_DEPTH == 10 || BIT_DEPTH == 12
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# if BIT_DEPTH == 10
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#define W1 22725 // 90901
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#define W2 21407 // 85627
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#define W3 19265 // 77062
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#define W4 16384 // 65535
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#define W5 12873 // 51491
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#define W6 8867 // 35468
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#define W7 4520 // 18081
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# ifdef EXTRA_SHIFT
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#define ROW_SHIFT 13
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#define COL_SHIFT 18
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#define DC_SHIFT 1
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# elif IN_IDCT_DEPTH == 32
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#define ROW_SHIFT 13
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#define COL_SHIFT 21
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#define DC_SHIFT 2
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# else
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#define ROW_SHIFT 12
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#define COL_SHIFT 19
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#define DC_SHIFT 2
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# endif
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# else
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#define W1 45451
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#define W2 42813
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#define W3 38531
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#define W4 32767
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#define W5 25746
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#define W6 17734
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#define W7 9041
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#define ROW_SHIFT 16
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#define COL_SHIFT 17
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#define DC_SHIFT -1
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# endif
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#define MUL(a, b) ((int)((SUINT)(a) * (b)))
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#define MAC(a, b, c) ((a) += (SUINT)(b) * (c))
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#else
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#error "Unsupported bitdepth"
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#endif
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#ifdef EXTRA_SHIFT
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static inline void FUNC(idctRowCondDC_extrashift)(int16_t *row, int extra_shift)
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#else
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static inline void FUNC6(idctRowCondDC)(idctin *row, int extra_shift)
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#endif
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{
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SUINT a0, a1, a2, a3, b0, b1, b2, b3;
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// TODO: Add DC-only support for int32_t input
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#if IN_IDCT_DEPTH == 16
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#if HAVE_FAST_64BIT
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#define ROW0_MASK (0xffffULL << 48 * HAVE_BIGENDIAN)
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if (((AV_RN64A(row) & ~ROW0_MASK) | AV_RN64A(row+4)) == 0) {
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uint64_t temp;
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if (DC_SHIFT - extra_shift >= 0) {
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temp = (row[0] * (1 << (DC_SHIFT - extra_shift))) & 0xffff;
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} else {
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temp = ((row[0] + (1<<(extra_shift - DC_SHIFT-1))) >> (extra_shift - DC_SHIFT)) & 0xffff;
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}
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temp += temp * (1 << 16);
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temp += temp * ((uint64_t) 1 << 32);
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AV_WN64A(row, temp);
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AV_WN64A(row + 4, temp);
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return;
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}
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#else
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if (!(AV_RN32A(row+2) |
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AV_RN32A(row+4) |
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AV_RN32A(row+6) |
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row[1])) {
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uint32_t temp;
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if (DC_SHIFT - extra_shift >= 0) {
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temp = (row[0] * (1 << (DC_SHIFT - extra_shift))) & 0xffff;
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} else {
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temp = ((row[0] + (1<<(extra_shift - DC_SHIFT-1))) >> (extra_shift - DC_SHIFT)) & 0xffff;
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}
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temp += temp * (1 << 16);
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AV_WN32A(row, temp);
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AV_WN32A(row+2, temp);
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AV_WN32A(row+4, temp);
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AV_WN32A(row+6, temp);
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return;
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}
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#endif
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#endif
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a0 = ((SUINT)W4 * row[0]) + (1 << (ROW_SHIFT + extra_shift - 1));
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a1 = a0;
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a2 = a0;
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a3 = a0;
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a0 += (SUINT)W2 * row[2];
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a1 += (SUINT)W6 * row[2];
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a2 -= (SUINT)W6 * row[2];
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a3 -= (SUINT)W2 * row[2];
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b0 = MUL(W1, row[1]);
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MAC(b0, W3, row[3]);
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b1 = MUL(W3, row[1]);
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MAC(b1, -W7, row[3]);
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b2 = MUL(W5, row[1]);
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MAC(b2, -W1, row[3]);
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b3 = MUL(W7, row[1]);
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MAC(b3, -W5, row[3]);
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#if IN_IDCT_DEPTH == 32
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if (AV_RN64A(row + 4) | AV_RN64A(row + 6)) {
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#else
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if (AV_RN64A(row + 4)) {
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#endif
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a0 += (SUINT) W4*row[4] + (SUINT)W6*row[6];
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a1 += (SUINT)- W4*row[4] - (SUINT)W2*row[6];
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a2 += (SUINT)- W4*row[4] + (SUINT)W2*row[6];
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a3 += (SUINT) W4*row[4] - (SUINT)W6*row[6];
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MAC(b0, W5, row[5]);
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MAC(b0, W7, row[7]);
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MAC(b1, -W1, row[5]);
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MAC(b1, -W5, row[7]);
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MAC(b2, W7, row[5]);
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MAC(b2, W3, row[7]);
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MAC(b3, W3, row[5]);
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MAC(b3, -W1, row[7]);
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}
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row[0] = (int)(a0 + b0) >> (ROW_SHIFT + extra_shift);
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row[7] = (int)(a0 - b0) >> (ROW_SHIFT + extra_shift);
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row[1] = (int)(a1 + b1) >> (ROW_SHIFT + extra_shift);
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row[6] = (int)(a1 - b1) >> (ROW_SHIFT + extra_shift);
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row[2] = (int)(a2 + b2) >> (ROW_SHIFT + extra_shift);
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row[5] = (int)(a2 - b2) >> (ROW_SHIFT + extra_shift);
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row[3] = (int)(a3 + b3) >> (ROW_SHIFT + extra_shift);
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row[4] = (int)(a3 - b3) >> (ROW_SHIFT + extra_shift);
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}
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#define IDCT_COLS do { \
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a0 = (SUINT)W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); \
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a1 = a0; \
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a2 = a0; \
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a3 = a0; \
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\
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a0 += (SUINT) W2*col[8*2]; \
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a1 += (SUINT) W6*col[8*2]; \
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a2 += (SUINT)-W6*col[8*2]; \
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a3 += (SUINT)-W2*col[8*2]; \
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\
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b0 = MUL(W1, col[8*1]); \
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b1 = MUL(W3, col[8*1]); \
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b2 = MUL(W5, col[8*1]); \
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b3 = MUL(W7, col[8*1]); \
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\
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MAC(b0, W3, col[8*3]); \
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MAC(b1, -W7, col[8*3]); \
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MAC(b2, -W1, col[8*3]); \
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MAC(b3, -W5, col[8*3]); \
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\
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if (col[8*4]) { \
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a0 += (SUINT) W4*col[8*4]; \
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a1 += (SUINT)-W4*col[8*4]; \
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a2 += (SUINT)-W4*col[8*4]; \
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a3 += (SUINT) W4*col[8*4]; \
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} \
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\
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if (col[8*5]) { \
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MAC(b0, W5, col[8*5]); \
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MAC(b1, -W1, col[8*5]); \
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MAC(b2, W7, col[8*5]); \
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MAC(b3, W3, col[8*5]); \
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} \
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\
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if (col[8*6]) { \
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a0 += (SUINT) W6*col[8*6]; \
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a1 += (SUINT)-W2*col[8*6]; \
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a2 += (SUINT) W2*col[8*6]; \
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a3 += (SUINT)-W6*col[8*6]; \
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} \
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\
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if (col[8*7]) { \
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MAC(b0, W7, col[8*7]); \
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MAC(b1, -W5, col[8*7]); \
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MAC(b2, W3, col[8*7]); \
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MAC(b3, -W1, col[8*7]); \
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} \
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} while (0)
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#ifdef EXTRA_SHIFT
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static inline void FUNC(idctSparseCol_extrashift)(int16_t *col)
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#else
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static inline void FUNC6(idctSparseColPut)(pixel *dest, ptrdiff_t line_size,
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idctin *col)
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{
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SUINT a0, a1, a2, a3, b0, b1, b2, b3;
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IDCT_COLS;
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dest[0] = av_clip_pixel((int)(a0 + b0) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a1 + b1) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a2 + b2) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a3 + b3) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a3 - b3) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a2 - b2) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a1 - b1) >> COL_SHIFT);
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dest += line_size;
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dest[0] = av_clip_pixel((int)(a0 - b0) >> COL_SHIFT);
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}
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static inline void FUNC6(idctSparseColAdd)(pixel *dest, ptrdiff_t line_size,
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idctin *col)
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{
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unsigned a0, a1, a2, a3, b0, b1, b2, b3;
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IDCT_COLS;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a0 + b0) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a1 + b1) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a2 + b2) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a3 + b3) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a3 - b3) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a2 - b2) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a1 - b1) >> COL_SHIFT));
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dest += line_size;
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dest[0] = av_clip_pixel(dest[0] + ((int)(a0 - b0) >> COL_SHIFT));
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}
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static inline void FUNC6(idctSparseCol)(idctin *col)
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#endif
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{
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unsigned a0, a1, a2, a3, b0, b1, b2, b3;
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IDCT_COLS;
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col[0 ] = ((int)(a0 + b0) >> COL_SHIFT);
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col[8 ] = ((int)(a1 + b1) >> COL_SHIFT);
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col[16] = ((int)(a2 + b2) >> COL_SHIFT);
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col[24] = ((int)(a3 + b3) >> COL_SHIFT);
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col[32] = ((int)(a3 - b3) >> COL_SHIFT);
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col[40] = ((int)(a2 - b2) >> COL_SHIFT);
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col[48] = ((int)(a1 - b1) >> COL_SHIFT);
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col[56] = ((int)(a0 - b0) >> COL_SHIFT);
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}
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#ifndef EXTRA_SHIFT
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void FUNC6(ff_simple_idct_put)(uint8_t *dest_, ptrdiff_t line_size, int16_t *block_)
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{
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idctin *block = (idctin *)block_;
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pixel *dest = (pixel *)dest_;
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int i;
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line_size /= sizeof(pixel);
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for (i = 0; i < 8; i++)
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FUNC6(idctRowCondDC)(block + i*8, 0);
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for (i = 0; i < 8; i++)
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FUNC6(idctSparseColPut)(dest + i, line_size, block + i);
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}
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#if IN_IDCT_DEPTH == 16
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void FUNC6(ff_simple_idct_add)(uint8_t *dest_, ptrdiff_t line_size, int16_t *block)
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{
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pixel *dest = (pixel *)dest_;
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int i;
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line_size /= sizeof(pixel);
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for (i = 0; i < 8; i++)
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FUNC6(idctRowCondDC)(block + i*8, 0);
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for (i = 0; i < 8; i++)
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FUNC6(idctSparseColAdd)(dest + i, line_size, block + i);
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}
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void FUNC6(ff_simple_idct)(int16_t *block)
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{
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int i;
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for (i = 0; i < 8; i++)
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FUNC6(idctRowCondDC)(block + i*8, 0);
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for (i = 0; i < 8; i++)
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FUNC6(idctSparseCol)(block + i);
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}
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#endif
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#endif
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