From 2968bedf129558024ea87a1aabc4aa2d3a5bcb6e Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Sat, 23 Jul 2011 15:46:35 +0200 Subject: bink: make IDCT take 32-bit input Since IDCT transforming 32-bit input to 8-bit output is unusual and unpractical for most codecs, move Bink IDCT into separate context. Get rid of an additional permutation table while at it since SIMD support for Bink IDCT is unlikely to be implemented in foreseeable future. Quantisation tables also have to change type to signed for proper dequantisation of DCT coefficients. Signed-off-by: Mans Rullgard --- libavcodec/binkdsp.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 119 insertions(+) create mode 100644 libavcodec/binkdsp.c (limited to 'libavcodec/binkdsp.c') diff --git a/libavcodec/binkdsp.c b/libavcodec/binkdsp.c new file mode 100644 index 0000000000..109906f262 --- /dev/null +++ b/libavcodec/binkdsp.c @@ -0,0 +1,119 @@ +/* + * Bink DSP routines + * Copyright (c) 2009 Kostya Shishkov + * + * 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 + * Bink DSP routines + */ + +#include "dsputil.h" +#include "binkdsp.h" + +#define A1 2896 /* (1/sqrt(2))<<12 */ +#define A2 2217 +#define A3 3784 +#define A4 -5352 + +#define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\ + const int a0 = (src)[s0] + (src)[s4]; \ + const int a1 = (src)[s0] - (src)[s4]; \ + const int a2 = (src)[s2] + (src)[s6]; \ + const int a3 = (A1*((src)[s2] - (src)[s6])) >> 11; \ + const int a4 = (src)[s5] + (src)[s3]; \ + const int a5 = (src)[s5] - (src)[s3]; \ + const int a6 = (src)[s1] + (src)[s7]; \ + const int a7 = (src)[s1] - (src)[s7]; \ + const int b0 = a4 + a6; \ + const int b1 = (A3*(a5 + a7)) >> 11; \ + const int b2 = ((A4*a5) >> 11) - b0 + b1; \ + const int b3 = (A1*(a6 - a4) >> 11) - b2; \ + const int b4 = ((A2*a7) >> 11) + b3 - b1; \ + (dest)[d0] = munge(a0+a2 +b0); \ + (dest)[d1] = munge(a1+a3-a2+b2); \ + (dest)[d2] = munge(a1-a3+a2+b3); \ + (dest)[d3] = munge(a0-a2 -b4); \ + (dest)[d4] = munge(a0-a2 +b4); \ + (dest)[d5] = munge(a1-a3+a2-b3); \ + (dest)[d6] = munge(a1+a3-a2-b2); \ + (dest)[d7] = munge(a0+a2 -b0); \ +} +/* end IDCT_TRANSFORM macro */ + +#define MUNGE_NONE(x) (x) +#define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src) + +#define MUNGE_ROW(x) (((x) + 0x7F)>>8) +#define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_ROW,src) + +static inline void bink_idct_col(int *dest, const int32_t *src) +{ + if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) { + dest[0] = + dest[8] = + dest[16] = + dest[24] = + dest[32] = + dest[40] = + dest[48] = + dest[56] = src[0]; + } else { + IDCT_COL(dest, src); + } +} + +static void bink_idct_c(int32_t *block) +{ + int i; + int temp[64]; + + for (i = 0; i < 8; i++) + bink_idct_col(&temp[i], &block[i]); + for (i = 0; i < 8; i++) { + IDCT_ROW( (&block[8*i]), (&temp[8*i]) ); + } +} + +static void bink_idct_add_c(uint8_t *dest, int linesize, int32_t *block) +{ + int i, j; + + bink_idct_c(block); + for (i = 0; i < 8; i++, dest += linesize, block += 8) + for (j = 0; j < 8; j++) + dest[j] += block[j]; +} + +static void bink_idct_put_c(uint8_t *dest, int linesize, int32_t *block) +{ + int i; + int temp[64]; + for (i = 0; i < 8; i++) + bink_idct_col(&temp[i], &block[i]); + for (i = 0; i < 8; i++) { + IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) ); + } +} + +void ff_binkdsp_init(BinkDSPContext *c) +{ + c->idct_add = bink_idct_add_c; + c->idct_put = bink_idct_put_c; +} -- cgit v1.2.3