/*****************************************************************************
*
* XVID MPEG-4 VIDEO CODEC
* - 8bit<->16bit transfer -
*
* Copyright(C) 2001-2002 Peter Ross
*
* This file is part of XviD, a free MPEG-4 video encoder/decoder
*
* XviD 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
*
* Under section 8 of the GNU General Public License, the copyright
* holders of XVID explicitly forbid distribution in the following
* countries:
*
* - Japan
* - United States of America
*
* Linking XviD statically or dynamically with other modules is making a
* combined work based on XviD. Thus, the terms and conditions of the
* GNU General Public License cover the whole combination.
*
* As a special exception, the copyright holders of XviD give you
* permission to link XviD with independent modules that communicate with
* XviD solely through the VFW1.1 and DShow interfaces, regardless of the
* license terms of these independent modules, and to copy and distribute
* the resulting combined work under terms of your choice, provided that
* every copy of the combined work is accompanied by a complete copy of
* the source code of XviD (the version of XviD used to produce the
* combined work), being distributed under the terms of the GNU General
* Public License plus this exception. An independent module is a module
* which is not derived from or based on XviD.
*
* Note that people who make modified versions of XviD are not obligated
* to grant this special exception for their modified versions; it is
* their choice whether to do so. The GNU General Public License gives
* permission to release a modified version without this exception; this
* exception also makes it possible to release a modified version which
* carries forward this exception.
*
* $Id: mem_transfer.c,v 1.8 2002-11-26 23:44:11 edgomez Exp $
*
****************************************************************************/
#include "../global.h"
#include "mem_transfer.h"
/* Function pointers - Initialized in the xvid.c module */
TRANSFER_8TO16COPY_PTR transfer_8to16copy;
TRANSFER_16TO8COPY_PTR transfer_16to8copy;
TRANSFER_8TO16SUB_PTR transfer_8to16sub;
TRANSFER_8TO16SUB2_PTR transfer_8to16sub2;
TRANSFER_16TO8ADD_PTR transfer_16to8add;
TRANSFER8X8_COPY_PTR transfer8x8_copy;
/*****************************************************************************
*
* All these functions are used to transfer data from a 8 bit data array
* to a 16 bit data array.
*
* This is typically used during motion compensation, that's why some
* functions also do the addition/substraction of another buffer during the
* so called transfer.
*
****************************************************************************/
/*
* SRC - the source buffer
* DST - the destination buffer
*
* Then the function does the 8->16 bit transfer and this serie of operations :
*
* SRC (8bit) = SRC
* DST (16bit) = SRC
*/
void
transfer_8to16copy_c(int16_t * const dst,
const uint8_t * const src,
uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
dst[j * 8 + i] = (int16_t) src[j * stride + i];
}
}
}
/*
* SRC - the source buffer
* DST - the destination buffer
*
* Then the function does the 8->16 bit transfer and this serie of operations :
*
* SRC (16bit) = SRC
* DST (8bit) = max(min(SRC, 255), 0)
*/
void
transfer_16to8copy_c(uint8_t * const dst,
const int16_t * const src,
uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
int16_t pixel = src[j * 8 + i];
if (pixel < 0) {
pixel = 0;
} else if (pixel > 255) {
pixel = 255;
}
dst[j * stride + i] = (uint8_t) pixel;
}
}
}
/*
* C - the current buffer
* R - the reference buffer
* DCT - the dct coefficient buffer
*
* Then the function does the 8->16 bit transfer and this serie of operations :
*
* R (8bit) = R
* C (8bit) = R
* DCT (16bit) = C - R
*/
void
transfer_8to16sub_c(int16_t * const dct,
uint8_t * const cur,
const uint8_t * ref,
const uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
uint8_t c = cur[j * stride + i];
uint8_t r = ref[j * stride + i];
cur[j * stride + i] = r;
dct[j * 8 + i] = (int16_t) c - (int16_t) r;
}
}
}
/*
* C - the current buffer
* R1 - the 1st reference buffer
* R2 - the 2nd reference buffer
* DCT - the dct coefficient buffer
*
* Then the function does the 8->16 bit transfer and this serie of operations :
*
* R1 (8bit) = R1
* R2 (8bit) = R2
* C (8bit) = C
* DCT (16bit)= C - min((R1 + R2)/2, 255)
*/
void
transfer_8to16sub2_c(int16_t * const dct,
uint8_t * const cur,
const uint8_t * ref1,
const uint8_t * ref2,
const uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
uint8_t c = cur[j * stride + i];
int r = (ref1[j * stride + i] + ref2[j * stride + i] + 1) / 2;
if (r > 255) {
r = 255;
}
/*cur[j * stride + i] = r; */
dct[j * 8 + i] = (int16_t) c - (int16_t) r;
}
}
}
/*
* SRC - the source buffer
* DST - the destination buffer
*
* Then the function does the 16->8 bit transfer and this serie of operations :
*
* SRC (16bit) = SRC
* DST (8bit) = max(min(DST+SRC, 255), 0)
*/
void
transfer_16to8add_c(uint8_t * const dst,
const int16_t * const src,
uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
int16_t pixel = (int16_t) dst[j * stride + i] + src[j * 8 + i];
if (pixel < 0) {
pixel = 0;
} else if (pixel > 255) {
pixel = 255;
}
dst[j * stride + i] = (uint8_t) pixel;
}
}
}
/*
* SRC - the source buffer
* DST - the destination buffer
*
* Then the function does the 8->8 bit transfer and this serie of operations :
*
* SRC (8bit) = SRC
* DST (8bit) = SRC
*/
void
transfer8x8_copy_c(uint8_t * const dst,
const uint8_t * const src,
const uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
dst[j * stride + i] = src[j * stride + i];
}
}
}