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https://github.com/FFmpeg/FFmpeg.git
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215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/*
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* Misc image convertion routines
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* Copyright (c) 2001 Gerard Lantau.
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*
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* 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
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "avcodec.h"
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/* XXX: totally non optimized */
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static void yuv422_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
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UINT8 *src, int width, int height)
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{
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int x, y;
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UINT8 *p = src;
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for(y=0;y<height;y+=2) {
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for(x=0;x<width;x+=2) {
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lum[0] = p[0];
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cb[0] = p[1];
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lum[1] = p[2];
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cr[0] = p[3];
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p += 4;
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lum += 2;
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cb++;
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cr++;
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}
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for(x=0;x<width;x+=2) {
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lum[0] = p[0];
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lum[1] = p[2];
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p += 4;
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lum += 2;
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}
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}
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}
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#define SCALEBITS 8
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#define ONE_HALF (1 << (SCALEBITS - 1))
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#define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))
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static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
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UINT8 *src, int width, int height)
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{
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int wrap, wrap3, x, y;
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int r, g, b, r1, g1, b1;
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UINT8 *p;
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wrap = width;
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wrap3 = width * 3;
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p = src;
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for(y=0;y<height;y+=2) {
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for(x=0;x<width;x+=2) {
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r = p[0];
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g = p[1];
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b = p[2];
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r1 = r;
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g1 = g;
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b1 = b;
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lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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r = p[3];
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g = p[4];
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b = p[5];
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r1 += r;
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g1 += g;
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b1 += b;
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lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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p += wrap3;
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lum += wrap;
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r = p[0];
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g = p[1];
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b = p[2];
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r1 += r;
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g1 += g;
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b1 += b;
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lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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r = p[3];
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g = p[4];
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b = p[5];
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r1 += r;
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g1 += g;
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b1 += b;
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lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
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FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
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cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
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FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
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cb++;
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cr++;
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p += -wrap3 + 2 * 3;
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lum += -wrap + 2;
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}
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p += wrap3;
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lum += wrap;
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}
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}
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static void bgr24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
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UINT8 *src, int width, int height)
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{
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int wrap, wrap3, x, y;
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int r, g, b, r1, g1, b1;
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UINT8 *p;
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wrap = width;
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wrap3 = width * 3;
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p = src;
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for(y=0;y<height;y+=2) {
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for(x=0;x<width;x+=2) {
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b = p[0];
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g = p[1];
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r = p[2];
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r1 = r;
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g1 = g;
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b1 = b;
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lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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b = p[3];
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g = p[4];
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r = p[5];
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r1 += r;
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g1 += g;
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b1 += b;
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lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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p += wrap3;
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lum += wrap;
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b = p[0];
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g = p[1];
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r = p[2];
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r1 += r;
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g1 += g;
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b1 += b;
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lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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b = p[3];
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g = p[4];
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r = p[5];
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r1 += r;
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g1 += g;
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b1 += b;
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lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
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cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
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FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
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cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
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FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
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cb++;
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cr++;
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p += -wrap3 + 2 * 3;
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lum += -wrap + 2;
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}
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p += wrap3;
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lum += wrap;
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}
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}
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int img_convert_to_yuv420(UINT8 *img_out, UINT8 *img,
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int pix_fmt, int width, int height)
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{
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UINT8 *pict;
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int size, size_out;
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UINT8 *picture[3];
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pict = img_out;
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size = width * height;
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size_out = (size * 3) / 2;
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picture[0] = pict;
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picture[1] = pict + size;
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picture[2] = picture[1] + (size / 4);
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switch(pix_fmt) {
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case PIX_FMT_YUV420P:
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memcpy(pict, img, size_out);
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break;
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case PIX_FMT_YUV422:
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yuv422_to_yuv420p(picture[0], picture[1], picture[2],
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img, width, height);
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break;
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case PIX_FMT_RGB24:
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rgb24_to_yuv420p(picture[0], picture[1], picture[2],
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img, width, height);
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break;
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case PIX_FMT_BGR24:
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bgr24_to_yuv420p(picture[0], picture[1], picture[2],
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img, width, height);
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break;
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}
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return size_out;
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}
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