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Revision 1.5 - (download) (annotate)
Thu Sep 5 20:42:47 2002 UTC (22 years, 1 month ago) by edgomez
Branch: MAIN
Changes since 1.4: +17 -17 lines
- Updated legal header with Peter's copyright for 2002
/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - 8bit<->16bit transfer -
 *
 *  Copyright(C) 2001-2002 Peter Ross <pross@cs.rmit.edu.au>
 *
 *  This program is an implementation of a part of one or more MPEG-4
 *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
 *  to use this software module in hardware or software products are
 *  advised that its use may infringe existing patents or copyrights, and
 *  any such use would be at such party's own risk.  The original
 *  developer of this software module and his/her company, and subsequent
 *  editors and their companies, will have no liability for use of this
 *  software or modifications or derivatives thereof.
 *
 *  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
 *
 * $Id: mem_transfer.c,v 1.5 2002/09/05 20:42:47 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];
		}
	}
}

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