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Diffstat (limited to 'libavcodec/simple_idct_template.c')
| -rw-r--r-- | libavcodec/simple_idct_template.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/libavcodec/simple_idct_template.c b/libavcodec/simple_idct_template.c new file mode 100644 index 0000000000..6d3f6f764d --- /dev/null +++ b/libavcodec/simple_idct_template.c @@ -0,0 +1,316 @@ +/* + * Simple IDCT + * + * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 "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 + +#define W1 90901 +#define W2 85627 +#define W3 77062 +#define W4 65535 +#define W5 51491 +#define W6 35468 +#define W7 18081 + +#define ROW_SHIFT 15 +#define COL_SHIFT 20 +#define DC_SHIFT 1 + +#define MUL(a, b) ((a) * (b)) +#define MAC(a, b, c) ((a) += (b) * (c)) + +#else + +#error "Unsupported bitdepth" + +#endif + +static inline void FUNC(idctRowCondDC)(DCTELEM *row) +{ + 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 = (row[0] << DC_SHIFT) & 0xffff; + temp += temp << 16; + temp += temp << 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 = (row[0] << DC_SHIFT) & 0xffff; + temp += temp << 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 - 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; + row[7] = (a0 - b0) >> ROW_SHIFT; + row[1] = (a1 + b1) >> ROW_SHIFT; + row[6] = (a1 - b1) >> ROW_SHIFT; + row[2] = (a2 + b2) >> ROW_SHIFT; + row[5] = (a2 - b2) >> ROW_SHIFT; + row[3] = (a3 + b3) >> ROW_SHIFT; + row[4] = (a3 - b3) >> ROW_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) + +static inline void FUNC(idctSparseColPut)(pixel *dest, int line_size, + DCTELEM *col) +{ + int a0, a1, a2, a3, b0, b1, b2, b3; + INIT_CLIP; + + IDCT_COLS; + + dest[0] = CLIP((a0 + b0) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a1 + b1) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a2 + b2) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a3 + b3) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a3 - b3) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a2 - b2) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a1 - b1) >> COL_SHIFT); + dest += line_size; + dest[0] = CLIP((a0 - b0) >> COL_SHIFT); +} + +static inline void FUNC(idctSparseColAdd)(pixel *dest, int line_size, + DCTELEM *col) +{ + int a0, a1, a2, a3, b0, b1, b2, b3; + INIT_CLIP; + + IDCT_COLS; + + dest[0] = CLIP(dest[0] + ((a0 + b0) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a1 + b1) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a2 + b2) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a3 + b3) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a3 - b3) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a2 - b2) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a1 - b1) >> COL_SHIFT)); + dest += line_size; + dest[0] = CLIP(dest[0] + ((a0 - b0) >> COL_SHIFT)); +} + +static inline void FUNC(idctSparseCol)(DCTELEM *col) +{ + 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); +} + +void FUNC(ff_simple_idct_put)(uint8_t *dest_, int line_size, DCTELEM *block) +{ + pixel *dest = (pixel *)dest_; + int i; + + line_size /= sizeof(pixel); + + for (i = 0; i < 8; i++) + FUNC(idctRowCondDC)(block + i*8); + + 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, DCTELEM *block) +{ + pixel *dest = (pixel *)dest_; + int i; + + line_size /= sizeof(pixel); + + for (i = 0; i < 8; i++) + FUNC(idctRowCondDC)(block + i*8); + + for (i = 0; i < 8; i++) + FUNC(idctSparseColAdd)(dest + i, line_size, block + i); +} + +void FUNC(ff_simple_idct)(DCTELEM *block) +{ + int i; + + for (i = 0; i < 8; i++) + FUNC(idctRowCondDC)(block + i*8); + + for (i = 0; i < 8; i++) + FUNC(idctSparseCol)(block + i); +} |