mpv/libmpcodecs/vf_rotate.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>

#include "config.h"
#include "mp_msg.h"

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

struct vf_priv_s {
    int direction;
};

static void rotate(unsigned char* dst,unsigned char* src,int dststride,int srcstride,int w,int h,int bpp,int dir){
    int y;
    if(dir&1){
	src+=srcstride*(w-1);
	srcstride*=-1;
    }
    if(dir&2){
	dst+=dststride*(h-1);
	dststride*=-1;
    }

    for(y=0;y<h;y++){
	int x;
	switch(bpp){
	case 1:
	    for(x=0;x<w;x++) dst[x]=src[y+x*srcstride];
	    break;
	case 2:
	    for(x=0;x<w;x++) *((short*)(dst+x*2))=*((short*)(src+y*2+x*srcstride));
	    break;
	case 3:
	    for(x=0;x<w;x++){
		dst[x*3+0]=src[0+y*3+x*srcstride];
		dst[x*3+1]=src[1+y*3+x*srcstride];
		dst[x*3+2]=src[2+y*3+x*srcstride];
	    }
	    break;
	case 4:
	    for(x=0;x<w;x++) *((int*)(dst+x*4))=*((int*)(src+y*4+x*srcstride));
	}
	dst+=dststride;
    }
}

//===========================================================================//

static int config(struct vf_instance_s* vf,
        int width, int height, int d_width, int d_height,
	unsigned int flags, unsigned int outfmt){
    if (vf->priv->direction & 4) {
	if (width<height) vf->priv->direction&=3;
    }
    if (vf->priv->direction & 4){
	vf->put_image=vf_next_put_image; // passthru mode!
	if (vf->next->draw_slice) vf->draw_slice=vf_next_draw_slice;
/* FIXME: this should be in an other procedure in vf.c; that should always check
     whether the filter after the passthrough one still (not)supports slices */
	return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
    }
    return vf_next_config(vf,height,width,d_height,d_width,flags,outfmt);
}

static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
    mp_image_t *dmpi;

    // hope we'll get DR buffer:
    dmpi=vf_get_image(vf->next,mpi->imgfmt,
	MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
	mpi->h, mpi->w);

    if(mpi->flags&MP_IMGFLAG_PLANAR){
	rotate(dmpi->planes[0],mpi->planes[0],
	       dmpi->stride[0],mpi->stride[0],
	       dmpi->w,dmpi->h,1,vf->priv->direction);
	rotate(dmpi->planes[1],mpi->planes[1],
	       dmpi->stride[1],mpi->stride[1],
	       dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,vf->priv->direction);
	rotate(dmpi->planes[2],mpi->planes[2],
	       dmpi->stride[2],mpi->stride[2],
	       dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,vf->priv->direction);
    } else {
	rotate(dmpi->planes[0],mpi->planes[0],
	       dmpi->stride[0],mpi->stride[0],
	       dmpi->w,dmpi->h,dmpi->bpp>>3,vf->priv->direction);	
	dmpi->planes[1] = mpi->planes[1]; // passthrough rgb8 palette
    }
    
    return vf_next_put_image(vf,dmpi, pts);
}

//===========================================================================//

static int query_format(struct vf_instance_s* vf, unsigned int fmt){
    if(IMGFMT_IS_RGB(fmt) || IMGFMT_IS_BGR(fmt)) return vf_next_query_format(vf, fmt);
    // we can support only symmetric (chroma_x_shift==chroma_y_shift) YUV formats:
    switch(fmt) {
	case IMGFMT_YV12:
	case IMGFMT_I420:
	case IMGFMT_IYUV:
	case IMGFMT_YVU9:
//	case IMGFMT_IF09:
	case IMGFMT_Y8:
	case IMGFMT_Y800:
	case IMGFMT_444P:
	    return vf_next_query_format(vf, fmt);
    }
    return 0;
}

static int open(vf_instance_t *vf, char* args){
    vf->config=config;
    vf->put_image=put_image;
    vf->query_format=query_format;
    vf->priv=malloc(sizeof(struct vf_priv_s));
    vf->priv->direction=args?atoi(args):0;
    return 1;
}

const vf_info_t vf_info_rotate = {
    "rotate",
    "rotate",
    "A'rpi",
    "",
    open,
    NULL
};

//===========================================================================//