mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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369 lines
9.7 KiB
C
369 lines
9.7 KiB
C
/* Gnome-Streamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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//#define DEBUG_ENABLED
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#include <math.h>
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#include <gst/gst.h>
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#include <gstvideoscale.h>
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#include <gst/meta/videoraw.h>
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static void gst_videoscale_scale_yuv(GstVideoScale *scale, unsigned char *src, unsigned char *dest);
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static void gst_videoscale_scale_rgb(GstVideoScale *scale, unsigned char *src, unsigned char *dest);
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/* scalers */
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static void generate_rowbytes(unsigned char *copy_row, int src_w, int dst_w, int bpp);
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static void gst_videoscale_scale_nearest(GstVideoScale *scale, unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh);
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static void gst_videoscale_scale_plane_slow(GstVideoScale *scale, unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh);
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static void gst_videoscale_scale_point_sample(GstVideoScale *scale, unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh);
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/* filters */
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static unsigned char gst_videoscale_bilinear(unsigned char *src, double x, double y, int sw, int sh);
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static unsigned char gst_videoscale_bicubic(unsigned char *src, double x, double y, int sw, int sh);
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GstVideoScale *gst_videoscale_new(gint sw, gint sh, gint dw, gint dh, GstColorSpaceType format, GstVideoScaleMethod method)
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{
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GstVideoScale *new = g_malloc(sizeof(GstVideoScale));
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gint scale_bytes;
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new->source_width = sw;
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new->source_height = sh;
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new->dest_width = dw;
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new->dest_height = dh;
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new->format = format;
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new->method = method;
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switch (format) {
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case GST_COLORSPACE_YUV420P:
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new->scale = gst_videoscale_scale_yuv;
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scale_bytes = 1;
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break;
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case GST_COLORSPACE_RGB555:
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case GST_COLORSPACE_RGB565:
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case GST_COLORSPACE_BGR555:
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case GST_COLORSPACE_BGR565:
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new->scale = gst_videoscale_scale_rgb;
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scale_bytes = 2;
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break;
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default:
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g_print("videoscale: unsupported video format %d\n", format);
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g_free(new);
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return NULL;
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}
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switch (method) {
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case GST_VIDEOSCALE_POINT_SAMPLE:
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new->scaler = gst_videoscale_scale_point_sample;
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DEBUG("videoscale: scaling method POINT_SAMPLE\n");
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break;
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case GST_VIDEOSCALE_NEAREST:
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generate_rowbytes(new->copy_row, sw, dw, scale_bytes);
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new->scaler = gst_videoscale_scale_nearest;
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DEBUG("videoscale: scaling method NEAREST\n");
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break;
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case GST_VIDEOSCALE_BILINEAR:
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new->scaler = gst_videoscale_scale_plane_slow;
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new->filter = gst_videoscale_bilinear;
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DEBUG("videoscale: scaling method BILINEAR\n");
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break;
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case GST_VIDEOSCALE_BICUBIC:
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new->scaler = gst_videoscale_scale_plane_slow;
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new->filter = gst_videoscale_bicubic;
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DEBUG("videoscale: scaling method BICUBIC\n");
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break;
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default:
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g_print("videoscale: unsupported scaling method %d\n", method);
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g_free(new);
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return NULL;
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}
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return new;
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}
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void gst_videoscale_destroy(GstVideoScale *scale)
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{
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g_free(scale);
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}
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static void gst_videoscale_scale_rgb(GstVideoScale *scale, unsigned char *src, unsigned char *dest)
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{
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int sw = scale->source_width;
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int sh = scale->source_height;
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int dw = scale->dest_width;
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int dh = scale->dest_height;
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DEBUG("videoscale: scaling RGB %dx%d to %dx%d\n", sw, sh, dw, dh);
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dw = ((dw + 1) & ~1) << 1;
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sw = sw<<1;
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DEBUG("videoscale: %p %p\n", src, dest);
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scale->scaler(scale, src, dest, sw, sh, dw, dh);
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}
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static void gst_videoscale_scale_yuv(GstVideoScale *scale, unsigned char *src, unsigned char *dest)
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{
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int sw = scale->source_width;
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int sh = scale->source_height;
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int dw = scale->dest_width;
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int dh = scale->dest_height;
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DEBUG("videoscale: scaling YUV420P %dx%d to %dx%d\n", sw, sh, dw, dh);
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scale->scaler(scale, src, dest, sw, sh, dw, dh);
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src += sw*sh;
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dest += dw*dh;
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dh = dh>>1;
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dw = dw>>1;
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sh = sh>>1;
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sw = sw>>1;
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scale->scaler(scale, src, dest, sw, sh, dw, dh);
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src += sw*sh;
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dest += dw*dh;
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scale->scaler(scale, src, dest, sw, sh, dw, dh);
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}
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#define RC(x,y) *(src+(int)(x)+(int)((y)*sw))
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static unsigned char gst_videoscale_bilinear(unsigned char *src, double x, double y, int sw, int sh) {
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int j=floor(x);
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int k=floor(y);
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double a=x-j;
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double b=y-k;
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double dest;
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int color;
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printf("videoscale: scaling bilinear %f %f %dx%d\n", x, y, sw, sh);
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dest=(1-a)*(1-b)*RC(j,k)+
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a*(1-b)*RC(j+1,k);
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k = MIN(sh-1, k);
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dest+= b*(1-a)*RC(j,k+1)+
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a*b*RC(j+1,k+1);
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color=rint(dest);
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if (color<0) color=abs(color); // cannot have negative values !
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//if (color<0) color=0; // cannot have negative values !
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if (color>255) color=255;
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return (unsigned char) color;
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}
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static unsigned char gst_videoscale_bicubic(unsigned char *src, double x, double y, int sw, int sh) {
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int j=floor(x);
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int k=floor(y), k2;
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double a=x-j;
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double b=y-k;
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double dest;
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int color;
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double t1, t2, t3, t4;
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double a1, a2, a3, a4;
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DEBUG("videoscale: scaling bicubic %dx%d\n", sw, sh);
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a1 = -a*(1-a)*(1-a);
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a2 = (1-2*a*a+a*a*a);
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a3 = a*(1+a-a*a);
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a4 = a*a*(1-a);
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k2 = MAX(0, k-1);
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t1=a1*RC(j-1,k2)+ a2*RC(j,k2)+ a3*RC(j+1,k2)- a4*RC(j+2,k2);
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t2=a1*RC(j-1,k)+ a2*RC(j,k)+ a3*RC(j+1,k)- a4*RC(j+2,k);
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k2 = MIN(sh, k+1);
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t3=a1*RC(j-1,k2)+ a2*RC(j,k2)+ a3*RC(j+1,k2)- a4*RC(j+2,k2);
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k2 = MIN(sh, k+2);
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t4=a1*RC(j-1,k2)+ a2*RC(j,k2)+ a3*RC(j+1,k2)- a4*RC(j+2,k2);
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dest= -b*(1-b)*(1-b)*t1+ (1-2*b*b+b*b*b)*t2+ b*(1+b-b*b)*t3+ b*b*(b-1)*t4;
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color=rint(dest);
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if (color<0) color=abs(color); // cannot have negative values !
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if (color>255) color=255;
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return (unsigned char) color;
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}
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static void gst_videoscale_scale_plane_slow(GstVideoScale *scale, unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh)
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{
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double zoomx = ((double)dw)/(double)sw;
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double zoomy = ((double)dh)/(double)sh;
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double xr, yr;
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int x, y;
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DEBUG("videoscale: scale plane slow %dx%d %dx%d %g %g %p %p\n", sw, sh, dw, dh, zoomx, zoomy, src, dest);
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for (y=0; y<dh; y++) {
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yr = ((double)y)/zoomy;
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for (x=0; x<dw; x++) {
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xr = ((double)x)/zoomx;
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DEBUG("videoscale: scale plane slow %g %g %p\n", xr, yr, (src+(int)(x)+(int)((y)*sw)));
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if (floor(xr) == xr && floor(yr) == yr){
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DEBUG("videoscale: scale plane %g %g %p %p\n", xr, yr, (src+(int)(x)+(int)((y)*sw)), dest);
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*dest++ = RC(xr, yr);
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}
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else {
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*dest++ = scale->filter(src, xr, yr, sw, sh);
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//*dest++ = gst_videoscale_bicubic(src, xr, yr, sw, sh);
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}
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}
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}
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}
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#define PREFIX16 0x66
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#define STORE_BYTE 0xAA
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#define STORE_WORD 0xAB
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#define LOAD_BYTE 0xAC
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#define LOAD_WORD 0xAD
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#define RETURN 0xC3
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static void generate_rowbytes(unsigned char *copy_row, int src_w, int dst_w, int bpp)
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{
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int i;
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int pos, inc;
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unsigned char *eip;
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unsigned char load, store;
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DEBUG("videoscale: setup scaling %p\n", copy_row);
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switch (bpp) {
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case 1:
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load = LOAD_BYTE;
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store = STORE_BYTE;
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break;
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case 2:
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case 4:
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load = LOAD_WORD;
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store = STORE_WORD;
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break;
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default:
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return;
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}
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pos = 0x10000;
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inc = (src_w << 16) / dst_w;
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eip = copy_row;
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for ( i=0; i<dst_w; ++i ) {
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while ( pos >= 0x10000L ) {
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if ( bpp == 2 ) {
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*eip++ = PREFIX16;
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}
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*eip++ = load;
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pos -= 0x10000L;
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}
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if ( bpp == 2 ) {
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*eip++ = PREFIX16;
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}
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*eip++ = store;
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pos += inc;
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}
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*eip++ = RETURN;
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DEBUG("scaler start/end %p %p %p\n", copy_row, eip, eip-copy_row);
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}
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static void gst_videoscale_scale_point_sample(GstVideoScale *scale, unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh)
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{
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int ypos, yinc, y;
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int xpos, xinc, x;
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int sum, xcount, ycount, loop;
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unsigned char *srcp, *srcp2;
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DEBUG("videoscale: scaling nearest %p %p %d\n", src, dest, dw);
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ypos = 0x10000;
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yinc = (sh<<16)/dh;
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xinc = (sw<<16)/dw;
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for (y = dh; y; y--) {
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ycount = 1;
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srcp = src;
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while (ypos >0x10000) {
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ycount++;
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ypos-=0x10000;
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src += sw;
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}
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xpos = 0x10000;
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for ( x=dw; x; x-- ) {
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xcount = 0;
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sum=0;
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while ( xpos >= 0x10000L ) {
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loop = ycount;
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srcp2 = srcp;
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while (loop--) {
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sum += *srcp2;
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srcp2 += sw;
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}
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srcp++;
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xcount++;
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xpos -= 0x10000L;
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}
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*dest++ = sum/(xcount*ycount);
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xpos += xinc;
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}
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ypos += yinc;
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}
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}
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static void gst_videoscale_scale_nearest(GstVideoScale *scale, unsigned char *src, unsigned char *dest, int sw, int sh, int dw, int dh)
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{
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int pos, inc, y;
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int u1, u2;
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scale->temp = scale->copy_row;
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DEBUG("videoscale: scaling nearest %p %p %p %d\n", scale->copy_row, src, dest, dw);
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pos = 0x10000;
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inc = (sh<<16)/dh;
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for (y = dh; y > 0; y--) {
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while (pos >0x10000) {
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src += sw;
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pos-=0x10000;
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}
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__asm__ __volatile__ ("
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movl %2, %%eax\n
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call *%%eax
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"
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: "=&D" (u1), "=&S" (u2)
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: "g" (scale->temp), "0" (dest), "1" (src)
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: "memory" );
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dest+= dw;
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pos += inc;
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}
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DEBUG("videoscale: scaling nearest done %p\n", scale->copy_row);
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}
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