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