diff options
author | Arpi <arpi@thot.banki.hu> | 2001-12-09 15:39:54 +0300 |
---|---|---|
committer | Arpi <arpi@thot.banki.hu> | 2001-12-09 15:39:54 +0300 |
commit | 37e8dcda368feb17279e5938f2045ce807f24968 (patch) | |
tree | fd172ad5495e7560136ad1681c78aae7e4e21ae3 /libavcodec/simple_idct.c | |
parent | d962f6fd3a95e3345a7c17df938c75f67a6c6363 (diff) |
new IDCT code by Michael Niedermayer (michaelni@gmx.at) - #define SIMPLE_IDCT to enable
Originally committed as revision 235 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/simple_idct.c')
-rw-r--r-- | libavcodec/simple_idct.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/libavcodec/simple_idct.c b/libavcodec/simple_idct.c new file mode 100644 index 0000000000..5459b81b35 --- /dev/null +++ b/libavcodec/simple_idct.c @@ -0,0 +1,231 @@ +/* + Copyright (C) 2001 Michael Niedermayer (michaelni@gmx.at) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +/* + based upon some outcommented c code from mpeg2dec (idct_mmx.c written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>) +*/ + +#include <inttypes.h> + +#include "simple_idct.h" + +#if 0 +#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */ +#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */ +#define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */ +#define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */ +#define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */ +#define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */ +#define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */ +#define ROW_SHIFT 8 +#define COL_SHIFT 17 +#else +#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 16384 //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 // 6 +#endif +#if 1 +static void inline idctRow (int16_t * row) +{ + int a0, a1, a2, a3, b0, b1, b2, b3; + const int C1 =W1; + const int C2 =W2; + const int C3 =W3; + const int C4 =W4; + const int C5 =W5; + const int C6 =W6; + const int C7 =W7; + + if( !(row[1] | row[2] |row[3] |row[4] |row[5] |row[6] | row[7])) { + row[0] = row[1] = row[2] = row[3] = row[4] = + row[5] = row[6] = row[7] = row[0]<<3; + return; + } + + a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6] + (1<<(ROW_SHIFT-1)); + a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6] + (1<<(ROW_SHIFT-1)); + a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6] + (1<<(ROW_SHIFT-1)); + a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6] + (1<<(ROW_SHIFT-1)); + + b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7]; + b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7]; + b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7]; + b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7]; + + row[0] = (a0 + b0) >> ROW_SHIFT; + row[1] = (a1 + b1) >> ROW_SHIFT; + row[2] = (a2 + b2) >> ROW_SHIFT; + row[3] = (a3 + b3) >> ROW_SHIFT; + row[4] = (a3 - b3) >> ROW_SHIFT; + row[5] = (a2 - b2) >> ROW_SHIFT; + row[6] = (a1 - b1) >> ROW_SHIFT; + row[7] = (a0 - b0) >> ROW_SHIFT; +} + +static void inline idctCol (int16_t * col) +{ + int a0, a1, a2, a3, b0, b1, b2, b3; + const int C1 =W1; + const int C2 =W2; + const int C3 =W3; + const int C4 =W4; + const int C5 =W5; + const int C6 =W6; + const int C7 =W7; +/* + if( !(col[8*1] | col[8*2] |col[8*3] |col[8*4] |col[8*5] |col[8*6] | col[8*7])) { + col[8*0] = col[8*1] = col[8*2] = col[8*3] = col[8*4] = + col[8*5] = col[8*6] = col[8*7] = col[8*0]<<3; + return; + }*/ + col[0] += (1<<(COL_SHIFT-1))/W4; + a0 = C4*col[8*0] + C2*col[8*2] + C4*col[8*4] + C6*col[8*6]; + a1 = C4*col[8*0] + C6*col[8*2] - C4*col[8*4] - C2*col[8*6]; + a2 = C4*col[8*0] - C6*col[8*2] - C4*col[8*4] + C2*col[8*6]; + a3 = C4*col[8*0] - C2*col[8*2] + C4*col[8*4] - C6*col[8*6]; + + b0 = C1*col[8*1] + C3*col[8*3] + C5*col[8*5] + C7*col[8*7]; + b1 = C3*col[8*1] - C7*col[8*3] - C1*col[8*5] - C5*col[8*7]; + b2 = C5*col[8*1] - C1*col[8*3] + C7*col[8*5] + C3*col[8*7]; + b3 = C7*col[8*1] - C5*col[8*3] + C3*col[8*5] - C1*col[8*7]; + + col[8*0] = (a0 + b0) >> COL_SHIFT; + col[8*1] = (a1 + b1) >> COL_SHIFT; + col[8*2] = (a2 + b2) >> COL_SHIFT; + col[8*3] = (a3 + b3) >> COL_SHIFT; + col[8*4] = (a3 - b3) >> COL_SHIFT; + col[8*5] = (a2 - b2) >> COL_SHIFT; + col[8*6] = (a1 - b1) >> COL_SHIFT; + col[8*7] = (a0 - b0) >> COL_SHIFT; +} + +void simple_idct (short *block) +{ + int i; + for(i=0; i<8; i++) + idctRow(block + 8*i); + + for(i=0; i<8; i++) + idctCol(block + i); + +} + +#else + +#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 16384 //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 COL_SHIFT 31 // 6 + +static void inline idctRow (int32_t *out, int16_t * row) +{ + int a0, a1, a2, a3, b0, b1, b2, b3; + const int C1 =W1; + const int C2 =W2; + const int C3 =W3; + const int C4 =W4; + const int C5 =W5; + const int C6 =W6; + const int C7 =W7; +/* + if( !(row[1] | row[2] |row[3] |row[4] |row[5] |row[6] | row[7])) { + row[0] = row[1] = row[2] = row[3] = row[4] = + row[5] = row[6] = row[7] = row[0]<<14; + return; + } +*/ + a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6]; + a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6]; + a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6]; + a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6]; + + b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7]; + b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7]; + b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7]; + b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7]; + + out[0] = (a0 + b0); + out[1] = (a1 + b1); + out[2] = (a2 + b2); + out[3] = (a3 + b3); + out[4] = (a3 - b3); + out[5] = (a2 - b2); + out[6] = (a1 - b1); + out[7] = (a0 - b0); +} + +static void inline idctCol (int32_t *in, int16_t * col) +{ + int64_t a0, a1, a2, a3, b0, b1, b2, b3; + const int64_t C1 =W1; + const int64_t C2 =W2; + const int64_t C3 =W3; + const int64_t C4 =W4; + const int64_t C5 =W5; + const int64_t C6 =W6; + const int64_t C7 =W7; +/* + if( !(col[8*1] | col[8*2] |col[8*3] |col[8*4] |col[8*5] |col[8*6] | col[8*7])) { + col[8*0] = col[8*1] = col[8*2] = col[8*3] = col[8*4] = + col[8*5] = col[8*6] = col[8*7] = col[8*0]<<3; + return; + }*/ + in[0] += (1<<(COL_SHIFT-1))/W4; + a0 = C4*in[8*0] + C2*in[8*2] + C4*in[8*4] + C6*in[8*6]; + a1 = C4*in[8*0] + C6*in[8*2] - C4*in[8*4] - C2*in[8*6]; + a2 = C4*in[8*0] - C6*in[8*2] - C4*in[8*4] + C2*in[8*6]; + a3 = C4*in[8*0] - C2*in[8*2] + C4*in[8*4] - C6*in[8*6]; + + b0 = C1*in[8*1] + C3*in[8*3] + C5*in[8*5] + C7*in[8*7]; + b1 = C3*in[8*1] - C7*in[8*3] - C1*in[8*5] - C5*in[8*7]; + b2 = C5*in[8*1] - C1*in[8*3] + C7*in[8*5] + C3*in[8*7]; + b3 = C7*in[8*1] - C5*in[8*3] + C3*in[8*5] - C1*in[8*7]; + + col[8*0] = (a0 + b0) >> COL_SHIFT; + col[8*1] = (a1 + b1) >> COL_SHIFT; + col[8*2] = (a2 + b2) >> COL_SHIFT; + col[8*3] = (a3 + b3) >> COL_SHIFT; + col[8*4] = (a3 - b3) >> COL_SHIFT; + col[8*5] = (a2 - b2) >> COL_SHIFT; + col[8*6] = (a1 - b1) >> COL_SHIFT; + col[8*7] = (a0 - b0) >> COL_SHIFT; +} + +void simple_idct (short *block) +{ + int i; + int32_t temp[64]; + for(i=0; i<8; i++) + idctRow(temp+8*i, block + 8*i); + + for(i=0; i<8; i++) + idctCol(temp+i, block + i); + +} + +#endif |