mpv/libmpcodecs/vf_screenshot.c

/*
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

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

#include "mp_msg.h"
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#include "vf_scale.h"
#include "fmt-conversion.h"
#include "libvo/fastmemcpy.h"

#include <libswscale/swscale.h>

struct vf_priv_s {
    mp_image_t *image;
    void (*image_callback)(void *, mp_image_t *);
    void *image_callback_ctx;
    int shot, store_slices;
};

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

static int config(struct vf_instance *vf,
                  int width, int height, int d_width, int d_height,
                  unsigned int flags, unsigned int outfmt)
{
    free_mp_image(vf->priv->image);
    vf->priv->image = new_mp_image(width, height);
    mp_image_setfmt(vf->priv->image, outfmt);
    vf->priv->image->w = d_width;
    vf->priv->image->h = d_height;
    return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}

static void start_slice(struct vf_instance *vf, mp_image_t *mpi)
{
    vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
        mpi->type, mpi->flags, mpi->width, mpi->height);
    if (vf->priv->shot) {
        vf->priv->store_slices = 1;
        if (!(vf->priv->image->flags & MP_IMGFLAG_ALLOCATED))
            mp_image_alloc_planes(vf->priv->image);
    }

}

static void memcpy_pic_slice(unsigned char *dst, unsigned char *src,
                             int bytesPerLine, int y, int h,
                             int dstStride, int srcStride)
{
    memcpy_pic(dst + h * dstStride, src + h * srcStride, bytesPerLine,
               h, dstStride, srcStride);
}

static void draw_slice(struct vf_instance *vf, unsigned char** src,
                       int* stride, int w,int h, int x, int y)
{
    if (vf->priv->store_slices) {
        mp_image_t *dst = vf->priv->image;
        int bp = (dst->bpp + 7) / 8;

        if (dst->flags & MP_IMGFLAG_PLANAR) {
            int bytes_per_line[3] = { w * bp, dst->chroma_width, dst->chroma_width };
            for (int n = 0; n < 3; n++) {
                memcpy_pic_slice(dst->planes[n], src[n], bytes_per_line[n],
                                 y, h, dst->stride[n], stride[n]);
            }
        } else {
            memcpy_pic_slice(dst->planes[0], src[0], dst->w*bp, y, dst->h,
                             dst->stride[0], stride[0]);
        }
    }
    vf_next_draw_slice(vf,src,stride,w,h,x,y);
}

static void get_image(struct vf_instance *vf, mp_image_t *mpi)
{
    // FIXME: should vf.c really call get_image when using slices??
    if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
      return;
    vf->dmpi= vf_get_image(vf->next, mpi->imgfmt,
                           mpi->type, mpi->flags/* | MP_IMGFLAG_READABLE*/, mpi->width, mpi->height);

    for (int i = 0; i < MP_MAX_PLANES; i++) {
        mpi->planes[i]=vf->dmpi->planes[i];
        mpi->stride[i]=vf->dmpi->stride[i];
    }
    mpi->width=vf->dmpi->width;

    mpi->flags|=MP_IMGFLAG_DIRECT;

    mpi->priv=(void*)vf->dmpi;
}

static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
{
    mp_image_t *dmpi = (mp_image_t *)mpi->priv;

    if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
      dmpi = vf->dmpi;
    else
    if(!(mpi->flags&MP_IMGFLAG_DIRECT)){
        dmpi=vf_get_image(vf->next,mpi->imgfmt,
                                    MP_IMGTYPE_EXPORT, 0,
                                    mpi->width, mpi->height);
        vf_clone_mpi_attributes(dmpi, mpi);
        for (int i = 0; i < MP_MAX_PLANES; i++) {
            dmpi->planes[i]=mpi->planes[i];
            dmpi->stride[i]=mpi->stride[i];
        }
        dmpi->width=mpi->width;
        dmpi->height=mpi->height;
    }

    if(vf->priv->shot) {
        vf->priv->shot=0;
        mp_image_t image;
        if (!vf->priv->store_slices)
            image = *dmpi;
        else
            image = *vf->priv->image;
        image.w = vf->priv->image->w;
        image.h = vf->priv->image->h;
        vf->priv->image_callback(vf->priv->image_callback_ctx, &image);
        vf->priv->store_slices = 0;
    }

    return vf_next_put_image(vf, dmpi, pts);
}

static int control (vf_instance_t *vf, int request, void *data)
{
    if(request==VFCTRL_SCREENSHOT) {
        struct vf_ctrl_screenshot *cmd = (struct vf_ctrl_screenshot *)data;
        vf->priv->image_callback = cmd->image_callback;
        vf->priv->image_callback_ctx = cmd->image_callback_ctx;
        vf->priv->shot=1;
        return CONTROL_TRUE;
    }
    return vf_next_control (vf, request, data);
}


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

static int query_format(struct vf_instance *vf, unsigned int fmt)
{
    enum PixelFormat av_format = imgfmt2pixfmt(fmt);

    if (av_format != PIX_FMT_NONE && sws_isSupportedInput(av_format))
        return vf_next_query_format(vf, fmt);
    return 0;
}

static void uninit(vf_instance_t *vf)
{
    free_mp_image(vf->priv->image);
    free(vf->priv);
}

static int vf_open(vf_instance_t *vf, char *args)
{
    vf->config=config;
    vf->control=control;
    vf->put_image=put_image;
    vf->query_format=query_format;
    vf->start_slice=start_slice;
    vf->draw_slice=draw_slice;
    vf->get_image=get_image;
    vf->uninit=uninit;
    vf->priv=malloc(sizeof(struct vf_priv_s));
    vf->priv->shot=0;
    vf->priv->store_slices=0;
    vf->priv->image=NULL;
    return 1;
}


const vf_info_t vf_info_screenshot = {
    "screenshot to file",
    "screenshot",
    "A'rpi, Jindrich Makovicka",
    "",
    vf_open,
    NULL
};

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