gstreamer/gst/videoflip/videoflip.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#define DEBUG_ENABLED
#include <gst/gst.h>
#include <stdlib.h>
#include <math.h>
#include <videoflip.h>
#include <string.h>
#include "config.h"
#include "gstvideoflip.h"
static void gst_videoflip_planar411 (GstVideoflip *scale, unsigned char *dest, unsigned char *src);
static void gst_videoflip_flip(GstVideoflip *videoflip, unsigned char *dest,
unsigned char *src, int sw, int sh, int dw, int dh);
struct videoflip_format_struct videoflip_formats[] = {
/* planar */
{ "YV12", 12, gst_videoflip_planar411, },
{ "I420", 12, gst_videoflip_planar411, },
};
int videoflip_n_formats = sizeof(videoflip_formats)/sizeof(videoflip_formats[0]);
GstCaps *
videoflip_get_caps(struct videoflip_format_struct *format)
{
unsigned int fourcc;
GstCaps *caps;
if(format->scale==NULL)
return NULL;
fourcc = GST_MAKE_FOURCC(format->fourcc[0],format->fourcc[1],format->fourcc[2],format->fourcc[3]);
if(format->bpp){
caps = GST_CAPS_NEW ("videoflip", "video/x-raw-rgb",
"depth", GST_PROPS_INT(format->bpp),
"bpp", GST_PROPS_INT(format->depth),
"endianness", GST_PROPS_INT(format->endianness),
"red_mask", GST_PROPS_INT(format->red_mask),
"green_mask", GST_PROPS_INT(format->green_mask),
"blue_mask", GST_PROPS_INT(format->blue_mask));
}else{
caps = GST_CAPS_NEW ("videoflip", "video/x-raw-yuv",
"format", GST_PROPS_FOURCC (fourcc));
}
return caps;
}
struct videoflip_format_struct *
videoflip_find_by_caps(GstCaps *caps)
{
int i;
GST_DEBUG ("finding %p",caps);
g_return_val_if_fail(caps != NULL, NULL);
for (i = 0; i < videoflip_n_formats; i++){
GstCaps *c;
c = videoflip_get_caps(videoflip_formats + i);
if(c){
if(gst_caps_is_always_compatible(caps, c)){
gst_caps_unref(c);
return videoflip_formats + i;
}
gst_caps_unref(c);
}
}
return NULL;
}
void
gst_videoflip_setup (GstVideoflip *videoflip)
{
if(videoflip->from_width==0 || videoflip->from_height==0){
return;
}
switch(videoflip->method){
case GST_VIDEOFLIP_METHOD_90R:
case GST_VIDEOFLIP_METHOD_90L:
case GST_VIDEOFLIP_METHOD_TRANS:
case GST_VIDEOFLIP_METHOD_OTHER:
videoflip->to_height = videoflip->from_width;
videoflip->to_width = videoflip->from_height;
break;
case GST_VIDEOFLIP_METHOD_IDENTITY:
case GST_VIDEOFLIP_METHOD_180:
case GST_VIDEOFLIP_METHOD_HORIZ:
case GST_VIDEOFLIP_METHOD_VERT:
videoflip->to_height = videoflip->from_height;
videoflip->to_width = videoflip->from_width;
break;
default:
/* FIXME */
break;
}
GST_DEBUG ("format=%p \"%s\" from %dx%d to %dx%d",
videoflip->format, videoflip->format->fourcc,
videoflip->from_width, videoflip->from_height,
videoflip->to_width, videoflip->to_height);
if(videoflip->method == GST_VIDEOFLIP_METHOD_IDENTITY){
GST_DEBUG ("videoflip: using passthru");
videoflip->passthru = TRUE;
videoflip->inited = TRUE;
return;
}
videoflip->from_buf_size = (videoflip->from_width * videoflip->from_height
* videoflip->format->depth) / 8;
videoflip->to_buf_size = (videoflip->to_width * videoflip->to_height
* videoflip->format->depth) / 8;
videoflip->inited = TRUE;
}
static void
gst_videoflip_planar411 (GstVideoflip *scale, unsigned char *dest, unsigned char *src)
{
int sw = scale->from_width;
int sh = scale->from_height;
int dw = scale->to_width;
int dh = scale->to_height;
GST_DEBUG ("videoflip: scaling planar 4:1:1 %dx%d to %dx%d", sw, sh, dw, dh);
gst_videoflip_flip(scale, dest, src, sw, sh, dw, dh);
src += sw*sh;
dest += dw*dh;
dh = dh>>1;
dw = dw>>1;
sh = sh>>1;
sw = sw>>1;
gst_videoflip_flip(scale, dest, src, sw, sh, dw, dh);
src += sw*sh;
dest += dw*dh;
gst_videoflip_flip(scale, dest, src, sw, sh, dw, dh);
}
static void
gst_videoflip_flip(GstVideoflip *videoflip, unsigned char *dest,
unsigned char *src, int sw, int sh, int dw, int dh)
{
int x,y;
switch(videoflip->method){
case GST_VIDEOFLIP_METHOD_90R:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[(sh - 1 - x)*sw + y];
}
}
break;
case GST_VIDEOFLIP_METHOD_90L:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[x*sw + (sw - 1 - y)];
}
}
break;
case GST_VIDEOFLIP_METHOD_180:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[(sh - 1 - y)*sw + (sw - 1 - x)];
}
}
break;
case GST_VIDEOFLIP_METHOD_HORIZ:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[y*sw + (sw - 1 - x)];
}
}
break;
case GST_VIDEOFLIP_METHOD_VERT:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[(sh - 1 - y)*sw + x];
}
}
break;
case GST_VIDEOFLIP_METHOD_TRANS:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[x*sw + y];
}
}
break;
case GST_VIDEOFLIP_METHOD_OTHER:
for(y=0;y<dh;y++){
for(x=0;x<dw;x++){
dest[y*dw + x] = src[(sh - 1 - x)*sw + (sw - 1 - y)];
}
}
break;
default:
/* FIXME */
break;
}
}