/************************************************************************** * * XVID MPEG-4 VIDEO CODEC * 8bit16bit transfer * * 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., 675 Mass Ave, Cambridge, MA 02139, USA. * *************************************************************************/ /************************************************************************** * * History: * * 07.01.2002 merge functions from compensate; rename functions * 22.12.2001 transfer_8to8add16 limit fix * 07.11.2001 initial version; (c)2001 peter ross * *************************************************************************/ #include "../global.h" #include "mem_transfer.h" // function pointers TRANSFER_8TO16COPY_PTR transfer_8to16copy; TRANSFER_16TO8COPY_PTR transfer_16to8copy; TRANSFER_8TO16SUB_PTR transfer_8to16sub; TRANSFER_16TO8ADD_PTR transfer_16to8add; TRANSFER8X8_COPY_PTR transfer8x8_copy; 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]; } } } 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; } } } /* perform motion compensation (and 8bit->16bit dct transfer) */ 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; } } } 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; } } } 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]; } } }
