#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]; } } }
