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621 lines
15 KiB
621 lines
15 KiB
/*
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* Microsoft YUV Codec -yuv411 -> rgb conversion functions
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*
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* Copyright (c) Microsoft Corporation 1993
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* All Rights Reserved
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*
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*/
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#include <windows.h>
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#include <windowsx.h>
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#include <mmsystem.h>
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#include <compddk.h>
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#include "msyuv.h"
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/*
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* This module provides translation from YUV into RGB. It translates
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* from 8-bit YUV 4:2:2 (as provided by the Spigot video capture driver)
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* or 7-bit YUV 4:1:1 (as provided by the Bravado driver) into 16-bit RGB555
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* or RGB565. All versions use a look-up table built using YUVToRGB555
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* or YUVToRGB565
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*/
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#define RANGE(x, lo, hi) max(lo, min(hi, x))
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/*
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* Convert a YUV colour into a 15-bit RGB colour.
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*
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* The input Y is in the range 16..235; the input U and V components
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* are in the range -128..+127. The conversion equations for this are
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* (according to CCIR 601):
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*
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* R = Y + 1.371 V
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* G = Y - 0.698 V - 0.336 U
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* B = Y + 1.732 U
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*
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* To avoid floating point, we scale all values by 1024.
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*
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* The resulting RGB values are in the range 16..235: we truncate these to
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* 5 bits each. and return a WORD containing 5-bits each for R, G and B
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* with bit 15 set to 0.
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*/
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WORD
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YUVToRGB555(int y, int u, int v)
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{
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int ScaledY = RANGE(y, 16, 235) * 1024;
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int red, green, blue;
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red = RANGE((ScaledY + (1404 * v)) / 1024, 0, 255);
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green = RANGE( (ScaledY - (715 * v) - (344 * u)) / 1024, 0, 255);
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blue = RANGE( (ScaledY + (1774 * u)) / 1024, 0, 255);
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return (WORD) (((red & 0xf8) << 7) | ((green & 0xf8) << 2) | ((blue & 0xf8) >>3) );
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}
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// same as above but converts to RGB565 instead
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WORD
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YUVToRGB565(int y, int u, int v)
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{
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int ScaledY = RANGE(y, 16, 235) * 1024;
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int red, green, blue;
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red = RANGE((ScaledY + (1404 * v)) / 1024, 0, 255);
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green = RANGE( (ScaledY - (715 * v) - (344 * u)) / 1024, 0, 255);
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blue = RANGE( (ScaledY + (1774 * u)) / 1024, 0, 255);
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return (WORD) (((red & 0xf8) << 8) | ((green & 0xfc) << 3) | ((blue & 0xf8) >>3) );
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}
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/* --- YUV 4:1:1 support ------------------------------------------ */
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/*
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* the input data is in YUV411 format. There is one 7 bit Luma sample
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* per pixel, and 1 each 7-bit U and V sample averaged over 4 pixels,
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* in the following layout:
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*
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* 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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* Word 0 u6 u5 v6 v5 y6 y5 y4 y3 y2 y1 y0
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*
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* Word 1 u4 u3 v4 v3 y6 y5 y4 y3 y2 y1 y0
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*
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* Word 2 u2 u1 v2 v1 y6 y5 y4 y3 y2 y1 y0
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*
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* Word 3 u0 v0 y6 y5 y4 y3 y2 y1 y0
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*
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* The 7-bit y values are unsigned (0..127), whereas the 7-bit
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* u and V values are signed (-64..+63).
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*
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*
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* For RGB: we truncate the YUV into a 15-bit format and use a prepared
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* lookup table to convert the 15-bit YUV into a 15- or 16-bit RGB value.
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*
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* The (64 kbyte) rgb555 lookup table is built by BuildYUVToRGB555.
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*
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*/
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/*
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* the YUV xlate tables use 5-bits per component with y in the ms bits, and
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* v in the ls bits. To convert from the above layout, look up the nibbles
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* containing the chroma bits in these tables and or together the result to
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* get a word with a 5-bit V component in bits 0..4, and a 5-bit
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* U component in bits 5..9. Note you only need three lookups since
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* we discard chroma bits 0 and 1.
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*/
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WORD ChromaBits65[] = {
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0x000, 0x008, 0x010, 0x018,
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0x100, 0x108, 0x110, 0x118,
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0x200, 0x208, 0x210, 0x218,
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0x300, 0x308, 0x310, 0x318
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};
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WORD ChromaBits43[] = {
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0x000, 0x002, 0x004, 0x006,
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0x040, 0x042, 0x044, 0x046,
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0x080, 0x082, 0x084, 0x086,
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0x0c0, 0x0c2, 0x0c4, 0x0c6
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};
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WORD ChromaBits2[] = {
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0x000, 0x000, 0x001, 0x001,
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0x000, 0x000, 0x001, 0x001,
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0x020, 0x020, 0x021, 0x021,
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0x020, 0x020, 0x021, 0x021
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};
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/*
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* build yuv411->RGB555 xlate table
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*/
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LPVOID BuildYUVToRGB555(PINSTINFO pinst)
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{
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LPVOID pXlate;
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LPWORD pRGB555;
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WORD w;
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if (pinst->pXlate != NULL) {
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return(pinst->pXlate);
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}
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/*
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* allocate a table big enough for 32k 2-byte entries
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*/
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pXlate = GlobalLock(GlobalAlloc(GPTR, 2 * 32 * 1024));
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pRGB555 = (LPWORD)pXlate;
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/*
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* build a 15-bit yuv lookup table by stepping through each entry,
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* converting the yuv index to rgb and storing at that index. The index
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* to this table is a 15-bit value with the y component in bits 14..10,
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* u in bits 9..5 and v in bits 4..0. Note that the y component is unsigned,
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* whereas the u and v components are signed.
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*/
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for (w = 0; w < 32*1024; w++) {
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/*
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* the YUVtoRGB55 conversion function takes values 0..255 for y,
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* and -128..+127 for u and v. Pick out the relevant bits of the
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* index for this cell, and shift to get values in this range.
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* Remember the cast to ensure sign-extension of these (8-bit) values -
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* and don't assume that chars are signed (they're not on MIPS).
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*/
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*pRGB555++ = YUVToRGB555(
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(w & 0x7c00) >> 7,
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(signed char) ((w & 0x3e0) >> 2),
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(signed char) ((w & 0x1f) << 3)
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);
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}
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return(pXlate);
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}
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/*
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* build yuv411->RGB565 xlate table
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*/
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LPVOID BuildYUVToRGB565(PINSTINFO pinst)
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{
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LPVOID pXlate;
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LPWORD pRGB;
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WORD w;
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if (pinst->pXlate != NULL) {
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return(pinst->pXlate);
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}
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/*
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* allocate a table big enough for 32k 2-byte entries
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*/
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pXlate = GlobalLock(GlobalAlloc(GPTR, 2 * 32 * 1024));
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pRGB = (LPWORD)pXlate;
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/*
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* build a 15-bit yuv lookup table by stepping through each entry,
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* converting the yuv index to rgb and storing at that index. The index
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* to this table is a 15-bit value with the y component in bits 14..10,
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* u in bits 9..5 and v in bits 4..0. Note that the y component is unsigned,
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* whereas the u and v components are signed.
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*/
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for (w = 0; w < 32*1024; w++) {
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/*
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* the YUVtoRGB conversion function takes values 0..255 for y,
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* and -128..+127 for u and v. Pick out the relevant bits of the
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* index for this cell, and shift to get values in this range.
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* Remember the cast to ensure sign-extension of these (8-bit) values -
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* and don't assume that chars are signed (they're not on MIPS).
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*/
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*pRGB++ = YUVToRGB565(
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(w & 0x7c00) >> 7,
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(signed char) ((w & 0x3e0) >> 2),
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(signed char) ((w & 0x1f) << 3)
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);
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}
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return(pXlate);
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}
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/*
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* translate one frame from yuv411 to 15/16 bit rgb.
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*
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* The YUV data is spread over 4 16-bit pixels in the format described
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* above. Pick out 4 pixels at a time, truncate them to 15-bit yuv,
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* lookup to translate to 15 or 16-bit rgb (depending on the lookup table
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* and write out.
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*
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* Flip vertically into correct dib format during conversion.
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*/
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VOID
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YUV411ToRGB(
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PINSTINFO pinst,
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LPBITMAPINFOHEADER lpbiInput,
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LPVOID lpInput,
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LPBITMAPINFOHEADER lpbiOutput,
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LPVOID lpOutput
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)
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{
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int RowInc;
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int i, j;
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DWORD Luma01, Luma23;
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DWORD Chroma;
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int Height, Width;
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int WidthBytes;
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PWORD pXlate;
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PWORD pDst;
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PDWORD pSrc;
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Height = lpbiInput->biHeight;
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Width = lpbiInput->biWidth;
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WidthBytes = Width*2; // size of (input and output) line
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pXlate = pinst->pXlate;
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/*
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* adjust the source to point to the start of the last line,
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* and work upwards (to flip vertically into DIB format)
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*/
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pSrc = (PDWORD) ( (PUCHAR) lpInput + ((Height - 1) * WidthBytes));
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pDst = (PWORD) lpOutput;
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/*
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* calculate the amount to adjust source by at the end of one line
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* of copying. At this point we are at the end of line N. We need
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* to move to the start of line N-1.
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*/
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RowInc = (WidthBytes * 2) / sizeof(DWORD);
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/* loop copying each scanline */
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for (i = 0; i < Height; i++) {
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/* loop copying four pixels at a time */
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for (j = 0; j < Width; j += 4) {
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/*
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* get four pixels and convert to 15-bpp YUV
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*/
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/* get luma for first 2 pixels + higher chroma bits */
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Luma01 = *pSrc++;
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/* pick out u,v components using lookup table.
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* u and v will be the bottom 10 bits of each pixel, so
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* convert to this layout
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*/
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Chroma = ChromaBits65[(Luma01 >> 12) & 0xf] |
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ChromaBits43[ (Luma01 >> 28) & 0xf ];
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/* next two pixels + lower chroma bits */
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Luma23 = *pSrc++;
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/* pickup u and v bits 2 - ignore bits 1, 0 since
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* we only use 5-bits per component for conversion
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*/
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Chroma |= ChromaBits2[ ( Luma23 >> 12) & 0xf];
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/*
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* combine luma for pix 0 with common chroma bits to
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* get 15-bit yuv, then lookup to convert to
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* rgb and store.
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*/
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*pDst++ = pXlate[ ((Luma01 & 0xf8) << 7) | Chroma];
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*pDst++ = pXlate[ ((Luma01 & 0xf80000) >> 9) | Chroma];
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*pDst++ = pXlate[ ((Luma23 & 0xf8) << 7) | Chroma];
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*pDst++ = pXlate[ ((Luma23 & 0xf80000) >> 9) | Chroma];
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} // loop per 4 pixels
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/* move source pointer back to next line */
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pSrc -= RowInc;
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} // loop per row
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}
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/* YUV 4:2:2 support ------------------------------------------ */
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/*
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* The captured data is in YUV 4:2:2, 8-bits per sample.
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* The data is laid out in alternating Y-U-Y-V-Y-U-Y-V format. Thus
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* every DWORD contains two complete pixels, in the
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* form (msb..lsb) V..Y1..U..Y0
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* All 3 components (y, u and v) are all unsigned 8-bit values in the range
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* 16..235.
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*
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* We have to double scan lines for >= 480 line formats since
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* the hardware only captured one field maximum.
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*
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*/
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/*
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* build a translation table to translate between YUV and RGB555.
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*
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* This builds a lookup table with 32k 1-word entries: truncate the YUV
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* to 15bits (5-5-5) and look-up in this xlate table to produce the
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* 15-bit rgb value.
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*/
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LPVOID BuildYUV422ToRGB555(PINSTINFO pinst)
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{
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LPVOID pXlate;
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LPWORD pRGB555;
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WORD w;
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if (pinst->pXlate != NULL) {
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return(pinst->pXlate);
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}
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/*
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* allocate a table big enough for 32k 2-byte entries
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*/
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pXlate = GlobalLock(GlobalAlloc(GPTR, 2 * 32 * 1024));
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pRGB555 = (LPWORD)pXlate;
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/*
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* build a 15-bit yuv lookup table by stepping through each entry,
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* converting the yuv index to rgb and storing at that index. The index
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* to this table is a 15-bit value with the y component in bits 14..10,
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* u in bits 9..5 and v in bits 4..0. Note that the y component is unsigned,
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* whereas the u and v components are signed.
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*/
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for (w = 0; w < 32*1024; w++) {
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/*
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* the YUVtoRGB55 conversion function takes values 0..255 for y,
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* and -128..+127 for u and v. Pick out the relevant bits of the
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* index for this cell, and shift to get values in this range.
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* Subtract 128 from u and v to shift from 0..255 to -128..+127
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*/
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*pRGB555++ = YUVToRGB555(
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(w & 0x7c00) >> 7,
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((w & 0x3e0) >> 2) - 128,
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((w & 0x1f) << 3) - 128
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);
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}
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return(pXlate);
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}
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/*
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* build a translation table to translate between YUV and RGB 5-6-5
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*
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* This builds a lookup table with 32k 1-word entries: truncate the YUV
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* to 15bits (5-5-5) and look-up in this xlate table to produce the
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* 16-bit rgb value.
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*/
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LPVOID BuildYUV422ToRGB565(PINSTINFO pinst)
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{
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LPVOID pXlate;
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LPWORD pRGB;
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WORD w;
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if (pinst->pXlate != NULL) {
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return(pinst->pXlate);
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}
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/*
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* allocate a table big enough for 32k 2-byte entries
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*/
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pXlate = GlobalLock(GlobalAlloc(GPTR, 2 * 32 * 1024));
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pRGB = (LPWORD)pXlate;
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/*
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* build a 15-bit yuv lookup table by stepping through each entry,
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* converting the yuv index to rgb and storing at that index. The index
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* to this table is a 15-bit value with the y component in bits 14..10,
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* u in bits 9..5 and v in bits 4..0. Note that the y component is unsigned,
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* whereas the u and v components are signed.
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*/
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for (w = 0; w < 32*1024; w++) {
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/*
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* the YUVtoRGB conversion function takes values 0..255 for y,
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* and -128..+127 for u and v. Pick out the relevant bits of the
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* index for this cell, and shift to get values in this range.
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* Subtract 128 from u and v to shift from 0..255 to -128..+127
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*/
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*pRGB++ = YUVToRGB565(
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(w & 0x7c00) >> 7,
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((w & 0x3e0) >> 2) - 128,
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((w & 0x1f) << 3) - 128
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);
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}
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return(pXlate);
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}
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/*
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* translate YUV 4:2:2 into 16-bit RGB using a lookup table. Flip vertically
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* into DIB format during processing. Double scanlines for formats of
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* 480 lines or greater. Produces 565 or 555 format RGB depending on the
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* xlate table.
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*/
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VOID
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YUV422ToRGB(
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PINSTINFO pinst,
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LPBITMAPINFOHEADER lpbiInput,
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LPVOID lpInput,
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LPBITMAPINFOHEADER lpbiOutput,
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LPVOID lpOutput
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)
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{
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int RowInc;
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int i, j;
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DWORD uv55, dwPixel;
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int WidthBytes; // width of one line in BYTES
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BOOL bDuplicate = FALSE;
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PDWORD pSrc, pDst;
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int Height, Width;
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PWORD pXlate;
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int InputHeight;
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|
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Height = lpbiInput->biHeight;
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InputHeight = Height;
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Width = lpbiInput->biWidth;
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WidthBytes = Width*2; // size of (input and output) line
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pXlate = pinst->pXlate;
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|
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/*
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* adjust the destination to point to the start of the last line,
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* and work upwards (to flip vertically into DIB format)
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*/
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pDst = (PDWORD) ( (LPBYTE)lpOutput + (Height - 1) * WidthBytes );
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pSrc = (PDWORD) lpInput;
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/*
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* do we need to duplicate scans to fill the destination ?
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*/
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if (Height >= 480) {
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bDuplicate = TRUE;
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/*
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* we need to skip one line each time we copy a line
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*/
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RowInc = WidthBytes * 2 + (Width * 2);
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InputHeight = Height/2;
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} else {
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|
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/*
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* calculate the amount to adjust pDst by at the end of one line
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|
* of copying. At this point we are at the end of line N. We need
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* to move to the start of line N-1.
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*/
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RowInc = WidthBytes + (Width * 2);
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}
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/* remember we are adding to a DWORD pointer */
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RowInc /= sizeof(DWORD);
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/* loop copying each scanline */
|
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for (i = InputHeight; i > 0; i--) {
|
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|
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/* loop copying two pixels at a time */
|
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for (j = Width ; j > 0; j -= 2) {
|
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|
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/*
|
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* get two pixels and convert to 15-bpp YUV
|
|
*/
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|
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dwPixel = *pSrc++;
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|
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/*
|
|
* dwPixel now has two pixels, in this layout (MSB..LSB):
|
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*
|
|
* V Y1 U Y0
|
|
*
|
|
* convert to 2 yuv555 words and lookup in xlate table
|
|
*/
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|
|
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/* get common u and v components to lower 10 bits */
|
|
uv55 = ((dwPixel & 0xf8000000) >> 27) |
|
|
((dwPixel & 0x0000f800) >> 6);
|
|
|
|
|
|
/* build each yuv-655 value by truncating
|
|
* y to 5 bits and adding the common u and v bits,
|
|
* look up to convert to rgb, and combine two pixels
|
|
* into one dword
|
|
*/
|
|
dwPixel = pXlate[ ((dwPixel & 0xf8) << 7) | uv55 ] |
|
|
(pXlate[((dwPixel & 0xf80000) >> 9) | uv55 ] << 16);
|
|
|
|
/* write two pixels to destination */
|
|
*pDst++ = dwPixel;
|
|
|
|
|
|
} // loop per 2 pixels
|
|
|
|
|
|
/* move dest pointer back to next line */
|
|
pDst -= RowInc;
|
|
|
|
} // loop per row
|
|
|
|
|
|
|
|
if (bDuplicate) {
|
|
|
|
PBYTE pbDst;
|
|
|
|
/*
|
|
* Note that since we started at the last line, and didn't duplicate,
|
|
* we placed data in lines 1, 3, 5 etc that needs to be copied
|
|
* to lines 0, 2, 4 etc.
|
|
*/
|
|
for (i = 0, pbDst = lpOutput; i < (int) Height; i+= 2) {
|
|
|
|
|
|
/*
|
|
* duplicate the scan line. We point at the first of the
|
|
* two lines - the data is in the second of the
|
|
* two lines.
|
|
*/
|
|
RtlCopyMemory(pbDst, pbDst + WidthBytes, WidthBytes);
|
|
|
|
/* skip this pair to get to the next line to be converted */
|
|
pbDst += WidthBytes * 2;
|
|
}
|
|
}
|
|
}
|
|
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|
|
VOID FreeXlate(PINSTINFO pinst)
|
|
{
|
|
|
|
GlobalFree(GlobalHandle(pinst->pXlate));
|
|
|
|
pinst->pXlate = NULL;
|
|
}
|
|
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