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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* - 8bit<->16bit transfer - |
* - 8bit<->16bit transfer - |
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* |
* |
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* Copyright(C) 2001-2002 Peter Ross <pross@cs.rmit.edu.au> |
* Copyright(C) 2001-2003 Peter Ross <pross@xvid.org> |
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* |
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* This program is an implementation of a part of one or more MPEG-4 |
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* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
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* to use this software module in hardware or software products are |
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* advised that its use may infringe existing patents or copyrights, and |
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* any such use would be at such party's own risk. The original |
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* developer of this software module and his/her company, and subsequent |
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* editors and their companies, will have no liability for use of this |
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* software or modifications or derivatives thereof. |
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* |
* |
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* This program is free software; you can redistribute it and/or modify |
* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
* it under the terms of the GNU General Public License as published by |
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TRANSFER_16TO8COPY_PTR transfer_16to8copy; |
TRANSFER_16TO8COPY_PTR transfer_16to8copy; |
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TRANSFER_8TO16SUB_PTR transfer_8to16sub; |
TRANSFER_8TO16SUB_PTR transfer_8to16sub; |
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TRANSFER_8TO16SUBRO_PTR transfer_8to16subro; |
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TRANSFER_8TO16SUB2_PTR transfer_8to16sub2; |
TRANSFER_8TO16SUB2_PTR transfer_8to16sub2; |
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TRANSFER_16TO8ADD_PTR transfer_16to8add; |
TRANSFER_16TO8ADD_PTR transfer_16to8add; |
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} |
} |
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void |
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transfer_8to16subro_c(int16_t * const dct, |
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const uint8_t * const cur, |
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const uint8_t * ref, |
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const uint32_t stride) |
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{ |
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uint32_t i, j; |
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for (j = 0; j < 8; j++) { |
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for (i = 0; i < 8; i++) { |
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uint8_t c = cur[j * stride + i]; |
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uint8_t r = ref[j * stride + i]; |
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dct[j * 8 + i] = (int16_t) c - (int16_t) r; |
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} |
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} |
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} |
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/* |
/* |
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* C - the current buffer |
* C - the current buffer |
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* R1 - the 1st reference buffer |
* R1 - the 1st reference buffer |
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* |
* |
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* R1 (8bit) = R1 |
* R1 (8bit) = R1 |
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* R2 (8bit) = R2 |
* R2 (8bit) = R2 |
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* C (8bit) = C |
* R (temp) = min((R1 + R2)/2, 255) |
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* DCT (16bit)= C - min((R1 + R2)/2, 255) |
* DCT (16bit)= C - R |
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* C (8bit) = R |
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*/ |
*/ |
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void |
void |
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transfer_8to16sub2_c(int16_t * const dct, |
transfer_8to16sub2_c(int16_t * const dct, |
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if (r > 255) { |
if (r > 255) { |
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r = 255; |
r = 255; |
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} |
} |
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//cur[j * stride + i] = r; |
cur[j * stride + i] = r; |
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dct[j * 8 + i] = (int16_t) c - (int16_t) r; |
dct[j * 8 + i] = (int16_t) c - (int16_t) r; |
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} |
} |
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} |
} |