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Original commit message from CVS: Fix caps negotiation in _getcaps and _link functions. Should be completely symmetric now.
742 lines
18 KiB
C
742 lines
18 KiB
C
/* GStreamer
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <stdlib.h>
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#include <math.h>
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#include <videoscale.h>
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#include <string.h>
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#include "gstvideoscale.h"
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#undef HAVE_CPU_I386
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#ifdef HAVE_CPU_I386
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#include "videoscale_x86.h"
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#endif
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/* scalers */
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static void gst_videoscale_scale_nearest (GstVideoscale *scale, unsigned char *dest, unsigned char *src,
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int sw, int sh, int dw, int dh);
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#if 0
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static void gst_videoscale_scale_plane_slow (GstVideoscale *scale, unsigned char *src, unsigned char *dest,
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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,
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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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#endif
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static void gst_videoscale_planar411 (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_planar400 (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_packed422 (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_packed422rev (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_32bit (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_24bit (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_16bit (GstVideoscale *scale, unsigned char *dest, unsigned char *src);
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static void gst_videoscale_scale_nearest_str2 (GstVideoscale *scale,
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unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
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static void gst_videoscale_scale_nearest_str4 (GstVideoscale *scale,
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unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
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static void gst_videoscale_scale_nearest_32bit (GstVideoscale *scale,
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unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
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static void gst_videoscale_scale_nearest_24bit (GstVideoscale *scale,
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unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
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static void gst_videoscale_scale_nearest_16bit (GstVideoscale *scale,
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unsigned char *dest, unsigned char *src, int sw, int sh, int dw, int dh);
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struct videoscale_format_struct videoscale_formats[] = {
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/* packed */
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{ "YUY2", 16, gst_videoscale_packed422, },
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{ "UYVY", 16, gst_videoscale_packed422rev, },
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{ "Y422", 16, gst_videoscale_packed422rev, },
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{ "UYNV", 16, gst_videoscale_packed422rev, },
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{ "YVYU", 16, gst_videoscale_packed422, },
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/* planar */
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{ "YV12", 12, gst_videoscale_planar411, },
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{ "I420", 12, gst_videoscale_planar411, },
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{ "Y800", 8, gst_videoscale_planar400, },
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/* RGB */
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{ "RGB ", 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0x00ff0000, 0x0000ff00, 0x000000ff },
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{ "RGB ", 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0x000000ff, 0x0000ff00, 0x00ff0000 },
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{ "RGB ", 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0xff000000, 0x00ff0000, 0x0000ff00 },
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{ "RGB ", 32, gst_videoscale_32bit, 24, G_BIG_ENDIAN, 0x0000ff00, 0x00ff0000, 0xff000000 },
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{ "RGB ", 24, gst_videoscale_24bit, 24, G_BIG_ENDIAN, 0xff0000, 0x00ff00, 0x0000ff },
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{ "RGB ", 24, gst_videoscale_24bit, 24, G_BIG_ENDIAN, 0x0000ff, 0x00ff00, 0xff0000 },
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{ "RGB ", 16, gst_videoscale_16bit, 16, G_BYTE_ORDER, 0xf800, 0x07e0, 0x001f },
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{ "RGB ", 16, gst_videoscale_16bit, 15, G_BYTE_ORDER, 0x7c00, 0x03e0, 0x001f },
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};
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int videoscale_n_formats = sizeof(videoscale_formats)/sizeof(videoscale_formats[0]);
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GstCaps *
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videoscale_get_caps(struct videoscale_format_struct *format)
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{
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unsigned int fourcc;
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GstCaps *caps;
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if(format->scale==NULL)
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return NULL;
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fourcc = GST_MAKE_FOURCC(format->fourcc[0],format->fourcc[1],format->fourcc[2],format->fourcc[3]);
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if(format->bpp){
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caps = GST_CAPS_NEW ("videoscale", "video/x-raw-rgb",
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"depth", GST_PROPS_INT(format->bpp),
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"bpp", GST_PROPS_INT(format->depth),
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"endianness", GST_PROPS_INT(format->endianness),
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"red_mask", GST_PROPS_INT(format->red_mask),
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"green_mask", GST_PROPS_INT(format->green_mask),
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"blue_mask", GST_PROPS_INT(format->blue_mask));
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}else{
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caps = GST_CAPS_NEW ("videoscale", "video/x-raw-yuv",
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"format", GST_PROPS_FOURCC (fourcc));
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}
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return caps;
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}
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struct videoscale_format_struct *
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videoscale_find_by_caps(GstCaps *caps)
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{
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int i;
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GST_DEBUG ("finding %p",caps);
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g_return_val_if_fail(caps != NULL, NULL);
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for (i = 0; i < videoscale_n_formats; i++){
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GstCaps *c;
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c = videoscale_get_caps(videoscale_formats + i);
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if(c){
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if(gst_caps_is_always_compatible(caps, c)){
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gst_caps_unref(c);
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return videoscale_formats + i;
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}
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gst_caps_unref(c);
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}
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}
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return NULL;
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}
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void
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gst_videoscale_setup (GstVideoscale *videoscale)
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{
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g_return_if_fail (GST_IS_VIDEOSCALE (videoscale));
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g_return_if_fail (videoscale->format != NULL);
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GST_DEBUG ("format=%p \"%s\" from %dx%d to %dx%d",
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videoscale->format, videoscale->format->fourcc,
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videoscale->from_width, videoscale->from_height,
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videoscale->to_width, videoscale->to_height);
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if(videoscale->to_width==0 || videoscale->to_height==0 ||
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videoscale->from_width==0 || videoscale->from_height==0){
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return;
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}
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if(videoscale->to_width == videoscale->from_width &&
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videoscale->to_height == videoscale->from_height){
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GST_DEBUG ("videoscale: using passthru");
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videoscale->passthru = TRUE;
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videoscale->inited = TRUE;
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return;
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}
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GST_DEBUG ("videoscale: scaling method POINT_SAMPLE");
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videoscale->from_buf_size = (videoscale->from_width * videoscale->from_height
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* videoscale->format->depth) / 8;
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videoscale->to_buf_size = (videoscale->to_width * videoscale->to_height
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* videoscale->format->depth) / 8;
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videoscale->passthru = FALSE;
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videoscale->inited = TRUE;
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}
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#if 0
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static void
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gst_videoscale_scale_rgb (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling RGB %dx%d to %dx%d", sw, sh, dw, dh);
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switch (scale->scale_bytes) {
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case 2:
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dw = ((dw + 1) & ~1) << 1;
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sw = sw<<1;
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break;
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case 4:
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dw = ((dw + 2) & ~3) << 2;
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sw = sw<<2;
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break;
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default:
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break;
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}
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GST_DEBUG ("videoscale: %p %p", src, dest);
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//scale->scaler(scale, src, dest, sw, sh, dw, dh);
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}
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#endif
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static void
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gst_videoscale_planar411 (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling planar 4:1:1 %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest(scale, dest, src, 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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gst_videoscale_scale_nearest(scale, dest, src, sw, sh, dw, dh);
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src += sw*sh;
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dest += dw*dh;
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gst_videoscale_scale_nearest(scale, dest, src, sw, sh, dw, dh);
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}
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static void
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gst_videoscale_planar400 (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling Y-only %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest(scale, dest, src, sw, sh, dw, dh);
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}
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static void
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gst_videoscale_packed422 (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling 4:2:2 %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest_str2(scale, dest, src, sw, sh, dw, dh);
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gst_videoscale_scale_nearest_str4(scale, dest+1, src+1, sw/2, sh, dw/2, dh);
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gst_videoscale_scale_nearest_str4(scale, dest+3, src+3, sw/2, sh, dw/2, dh);
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}
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static void
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gst_videoscale_packed422rev (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling 4:2:2 %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest_str2(scale, dest+1, src, sw, sh, dw, dh);
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gst_videoscale_scale_nearest_str4(scale, dest, src+1, sw/2, sh, dw/2, dh);
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gst_videoscale_scale_nearest_str4(scale, dest+2, src+3, sw/2, sh, dw/2, dh);
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}
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static void
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gst_videoscale_32bit (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling 32bit %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest_32bit(scale, dest, src, sw, sh, dw, dh);
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}
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static void
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gst_videoscale_24bit (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling 24bit %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest_24bit(scale, dest, src, sw, sh, dw, dh);
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}
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static void
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gst_videoscale_16bit (GstVideoscale *scale, unsigned char *dest, unsigned char *src)
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{
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int sw = scale->from_width;
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int sh = scale->from_height;
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int dw = scale->to_width;
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int dh = scale->to_height;
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GST_DEBUG ("videoscale: scaling 16bit %dx%d to %dx%d", sw, sh, dw, dh);
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gst_videoscale_scale_nearest_16bit(scale, dest, src, sw, sh, dw, dh);
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}
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#if 0
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#define RC(x,y) *(src+(int)(x)+(int)((y)*sw))
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static unsigned char
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gst_videoscale_bilinear (unsigned char *src, double x, double y, int sw, int sh)
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{
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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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GST_DEBUG ("videoscale: scaling bilinear %f %f %dx%d", 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
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gst_videoscale_bicubic (unsigned char *src, double x, double y, int sw, int sh)
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{
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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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GST_DEBUG ("videoscale: scaling bicubic %dx%d", 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
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gst_videoscale_scale_plane_slow (GstVideoscale *scale, unsigned char *src, unsigned char *dest,
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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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GST_DEBUG ("videoscale: scale plane slow %dx%d %dx%d %g %g %p %p", 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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GST_DEBUG ("videoscale: scale plane slow %g %g %p", xr, yr, (src+(int)(x)+(int)((y)*sw)));
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if (floor(xr) == xr && floor(yr) == yr){
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GST_DEBUG ("videoscale: scale plane %g %g %p %p", 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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#endif
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#if 0
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static void
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gst_videoscale_scale_point_sample (GstVideoscale *scale, unsigned char *src, unsigned char *dest,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
int sum, xcount, ycount, loop;
|
|
unsigned char *srcp, *srcp2;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest point sample %p %p %d", src, dest, dw);
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
ycount = 1;
|
|
srcp = src;
|
|
while (ypos >0x10000) {
|
|
ycount++;
|
|
ypos-=0x10000;
|
|
src += sw;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
for ( x=dw; x; x-- ) {
|
|
xcount = 0;
|
|
sum=0;
|
|
while ( xpos >= 0x10000L ) {
|
|
loop = ycount;
|
|
srcp2 = srcp;
|
|
while (loop--) {
|
|
sum += *srcp2;
|
|
srcp2 += sw;
|
|
}
|
|
srcp++;
|
|
xcount++;
|
|
xpos -= 0x10000L;
|
|
}
|
|
*dest++ = sum/(xcount*ycount);
|
|
xpos += xinc;
|
|
}
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
gst_videoscale_scale_nearest (GstVideoscale *scale,
|
|
unsigned char *dest,
|
|
unsigned char *src,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
guchar *destp = dest;
|
|
guchar *srcp = src;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest %p %p %d", src, dest, dw);
|
|
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
while (ypos >0x10000) {
|
|
ypos-=0x10000;
|
|
src += sw;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
|
|
srcp = src;
|
|
destp = dest;
|
|
|
|
for ( x=dw; x; x-- ) {
|
|
while ( xpos >= 0x10000L ) {
|
|
srcp++;
|
|
xpos -= 0x10000L;
|
|
}
|
|
*destp++ = *srcp;
|
|
xpos += xinc;
|
|
}
|
|
dest += dw;
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_videoscale_scale_nearest_str2 (GstVideoscale *scale,
|
|
unsigned char *dest,
|
|
unsigned char *src,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
guchar *destp = dest;
|
|
guchar *srcp = src;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest %p %p %d", src, dest, dw);
|
|
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
while (ypos >0x10000) {
|
|
ypos-=0x10000;
|
|
src += sw*2;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
|
|
srcp = src;
|
|
destp = dest;
|
|
|
|
for ( x=dw; x; x-- ) {
|
|
while ( xpos >= 0x10000L ) {
|
|
srcp+=2;
|
|
xpos -= 0x10000L;
|
|
}
|
|
*destp = *srcp;
|
|
destp+=2;
|
|
xpos += xinc;
|
|
}
|
|
dest += dw*2;
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_videoscale_scale_nearest_str4 (GstVideoscale *scale,
|
|
unsigned char *dest,
|
|
unsigned char *src,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
guchar *destp = dest;
|
|
guchar *srcp = src;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest %p %p %d", src, dest, dw);
|
|
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
while (ypos >0x10000) {
|
|
ypos-=0x10000;
|
|
src += sw*4;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
|
|
srcp = src;
|
|
destp = dest;
|
|
|
|
for ( x=dw; x; x-- ) {
|
|
while ( xpos >= 0x10000L ) {
|
|
srcp+=4;
|
|
xpos -= 0x10000L;
|
|
}
|
|
*destp = *srcp;
|
|
destp+=4;
|
|
xpos += xinc;
|
|
}
|
|
dest += dw*4;
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_videoscale_scale_nearest_32bit (GstVideoscale *scale,
|
|
unsigned char *dest,
|
|
unsigned char *src,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
guchar *destp = dest;
|
|
guchar *srcp = src;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest %p %p %d", src, dest, dw);
|
|
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
while (ypos >0x10000) {
|
|
ypos-=0x10000;
|
|
src += sw*4;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
|
|
srcp = src;
|
|
destp = dest;
|
|
|
|
for ( x=dw; x; x-- ) {
|
|
while ( xpos >= 0x10000L ) {
|
|
srcp+=4;
|
|
xpos -= 0x10000L;
|
|
}
|
|
*(guint32 *)destp = *(guint32 *)srcp;
|
|
destp+=4;
|
|
xpos += xinc;
|
|
}
|
|
dest += dw*4;
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_videoscale_scale_nearest_24bit (GstVideoscale *scale,
|
|
unsigned char *dest,
|
|
unsigned char *src,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
guchar *destp = dest;
|
|
guchar *srcp = src;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest %p %p %d", src, dest, dw);
|
|
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
while (ypos >0x10000) {
|
|
ypos-=0x10000;
|
|
src += sw*3;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
|
|
srcp = src;
|
|
destp = dest;
|
|
|
|
for ( x=dw; x; x-- ) {
|
|
while ( xpos >= 0x10000L ) {
|
|
srcp+=3;
|
|
xpos -= 0x10000L;
|
|
}
|
|
destp[0] = srcp[0];
|
|
destp[1] = srcp[1];
|
|
destp[2] = srcp[2];
|
|
destp+=3;
|
|
xpos += xinc;
|
|
}
|
|
dest += dw*3;
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_videoscale_scale_nearest_16bit (GstVideoscale *scale,
|
|
unsigned char *dest,
|
|
unsigned char *src,
|
|
int sw, int sh, int dw, int dh)
|
|
{
|
|
int ypos, yinc, y;
|
|
int xpos, xinc, x;
|
|
guchar *destp = dest;
|
|
guchar *srcp = src;
|
|
|
|
GST_DEBUG ("videoscale: scaling nearest %p %p %d", src, dest, dw);
|
|
|
|
|
|
ypos = 0x10000;
|
|
yinc = (sh<<16)/dh;
|
|
xinc = (sw<<16)/dw;
|
|
|
|
for (y = dh; y; y--) {
|
|
|
|
while (ypos >0x10000) {
|
|
ypos-=0x10000;
|
|
src += sw*2;
|
|
}
|
|
|
|
xpos = 0x10000;
|
|
|
|
srcp = src;
|
|
destp = dest;
|
|
|
|
for ( x=dw; x; x-- ) {
|
|
while ( xpos >= 0x10000L ) {
|
|
srcp+=2;
|
|
xpos -= 0x10000L;
|
|
}
|
|
destp[0] = srcp[0];
|
|
destp[1] = srcp[1];
|
|
destp+=2;
|
|
xpos += xinc;
|
|
}
|
|
dest += dw*2;
|
|
|
|
ypos += yinc;
|
|
}
|
|
}
|
|
|