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ffmpeg / libavfilter / libmpcodecs / vf_screenshot.c @ e4852fb3

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/*
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 * This file is part of MPlayer.
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 *
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 * MPlayer is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * MPlayer 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
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License along
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 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 */
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#if HAVE_MALLOC_H
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#include <malloc.h>
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#endif
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#include <string.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "mp_msg.h"
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#include "img_format.h"
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#include "mp_image.h"
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#include "vf.h"
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#include "vf_scale.h"
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#include "libswscale/swscale.h"
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#include "libavcodec/avcodec.h"
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struct vf_priv_s {
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    int frameno;
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    char fname[102];
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    /// shot stores current screenshot mode:
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    /// 0: don't take screenshots
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    /// 1: take single screenshot, reset to 0 afterwards
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    /// 2: take screenshots of each frame
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    int shot, store_slices;
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    int dw, dh, stride;
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    uint8_t *buffer;
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    struct SwsContext *ctx;
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    AVCodecContext *avctx;
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    uint8_t *outbuffer;
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    int outbuffer_size;
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};
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//===========================================================================//
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static int config(struct vf_instance *vf,
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                  int width, int height, int d_width, int d_height,
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                  unsigned int flags, unsigned int outfmt)
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{
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    vf->priv->ctx=sws_getContextFromCmdLine(width, height, outfmt,
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                                 d_width, d_height, IMGFMT_RGB24);
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    vf->priv->outbuffer_size = d_width * d_height * 3 * 2;
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    vf->priv->outbuffer = realloc(vf->priv->outbuffer, vf->priv->outbuffer_size);
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    vf->priv->avctx->width = d_width;
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    vf->priv->avctx->height = d_height;
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    vf->priv->avctx->pix_fmt = PIX_FMT_RGB24;
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    vf->priv->avctx->compression_level = 0;
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    vf->priv->dw = d_width;
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    vf->priv->dh = d_height;
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    vf->priv->stride = (3*vf->priv->dw+15)&~15;
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    free(vf->priv->buffer); // probably reconfigured
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    vf->priv->buffer = NULL;
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    return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
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}
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static void write_png(struct vf_priv_s *priv)
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{
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    char *fname = priv->fname;
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    FILE * fp;
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    AVFrame pic;
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    int size;
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    fp = fopen (fname, "wb");
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    if (fp == NULL) {
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        mp_msg(MSGT_VFILTER,MSGL_ERR,"\nPNG Error opening %s for writing!\n", fname);
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        return;
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    }
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    pic.data[0] = priv->buffer;
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    pic.linesize[0] = priv->stride;
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    size = avcodec_encode_video(priv->avctx, priv->outbuffer, priv->outbuffer_size, &pic);
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    if (size > 0)
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        fwrite(priv->outbuffer, size, 1, fp);
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    fclose (fp);
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}
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static int fexists(char *fname)
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{
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    struct stat dummy;
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    if (stat(fname, &dummy) == 0) return 1;
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    else return 0;
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}
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static void gen_fname(struct vf_priv_s* priv)
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{
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    do {
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        snprintf (priv->fname, 100, "shot%04d.png", ++priv->frameno);
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    } while (fexists(priv->fname) && priv->frameno < 100000);
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    if (fexists(priv->fname)) {
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        priv->fname[0] = '\0';
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        return;
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    }
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    mp_msg(MSGT_VFILTER,MSGL_INFO,"*** screenshot '%s' ***\n",priv->fname);
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}
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static void scale_image(struct vf_priv_s* priv, mp_image_t *mpi)
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{
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    uint8_t *dst[MP_MAX_PLANES] = {NULL};
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    int dst_stride[MP_MAX_PLANES] = {0};
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    dst_stride[0] = priv->stride;
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    if (!priv->buffer)
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        priv->buffer = av_malloc(dst_stride[0]*priv->dh);
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    dst[0] = priv->buffer;
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    sws_scale(priv->ctx, mpi->planes, mpi->stride, 0, priv->dh, dst, dst_stride);
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}
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static void start_slice(struct vf_instance *vf, mp_image_t *mpi)
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{
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    vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
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        mpi->type, mpi->flags, mpi->width, mpi->height);
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    if (vf->priv->shot) {
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        vf->priv->store_slices = 1;
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        if (!vf->priv->buffer)
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            vf->priv->buffer = av_malloc(vf->priv->stride*vf->priv->dh);
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    }
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}
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static void draw_slice(struct vf_instance *vf, unsigned char** src,
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                       int* stride, int w,int h, int x, int y)
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{
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    if (vf->priv->store_slices) {
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        uint8_t *dst[MP_MAX_PLANES] = {NULL};
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        int dst_stride[MP_MAX_PLANES] = {0};
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        dst_stride[0] = vf->priv->stride;
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        dst[0] = vf->priv->buffer;
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        sws_scale(vf->priv->ctx, src, stride, y, h, dst, dst_stride);
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    }
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    vf_next_draw_slice(vf,src,stride,w,h,x,y);
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}
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static void get_image(struct vf_instance *vf, mp_image_t *mpi)
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{
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    // FIXME: should vf.c really call get_image when using slices??
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    if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
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      return;
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    vf->dmpi= vf_get_image(vf->next, mpi->imgfmt,
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                           mpi->type, mpi->flags/* | MP_IMGFLAG_READABLE*/, mpi->width, mpi->height);
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    mpi->planes[0]=vf->dmpi->planes[0];
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    mpi->stride[0]=vf->dmpi->stride[0];
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    if(mpi->flags&MP_IMGFLAG_PLANAR){
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        mpi->planes[1]=vf->dmpi->planes[1];
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        mpi->planes[2]=vf->dmpi->planes[2];
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        mpi->stride[1]=vf->dmpi->stride[1];
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        mpi->stride[2]=vf->dmpi->stride[2];
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    }
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    mpi->width=vf->dmpi->width;
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    mpi->flags|=MP_IMGFLAG_DIRECT;
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    mpi->priv=(void*)vf->dmpi;
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}
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static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
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{
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    mp_image_t *dmpi = (mp_image_t *)mpi->priv;
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    if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
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      dmpi = vf->dmpi;
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    else
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    if(!(mpi->flags&MP_IMGFLAG_DIRECT)){
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        dmpi=vf_get_image(vf->next,mpi->imgfmt,
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                                    MP_IMGTYPE_EXPORT, 0,
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                                    mpi->width, mpi->height);
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        vf_clone_mpi_attributes(dmpi, mpi);
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        dmpi->planes[0]=mpi->planes[0];
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        dmpi->planes[1]=mpi->planes[1];
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        dmpi->planes[2]=mpi->planes[2];
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        dmpi->stride[0]=mpi->stride[0];
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        dmpi->stride[1]=mpi->stride[1];
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        dmpi->stride[2]=mpi->stride[2];
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        dmpi->width=mpi->width;
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        dmpi->height=mpi->height;
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    }
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    if(vf->priv->shot) {
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        if (vf->priv->shot==1)
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            vf->priv->shot=0;
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        gen_fname(vf->priv);
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        if (vf->priv->fname[0]) {
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            if (!vf->priv->store_slices)
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              scale_image(vf->priv, dmpi);
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            write_png(vf->priv);
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        }
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        vf->priv->store_slices = 0;
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    }
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    return vf_next_put_image(vf, dmpi, pts);
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}
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static int control (vf_instance_t *vf, int request, void *data)
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{
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    /** data contains an integer argument
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     * 0: take screenshot with the next frame
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     * 1: take screenshots with each frame until the same command is given once again
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     **/
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    if(request==VFCTRL_SCREENSHOT) {
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        if (data && *(int*)data) { // repeated screenshot mode
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            if (vf->priv->shot==2)
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                vf->priv->shot=0;
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            else
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                vf->priv->shot=2;
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        } else { // single screenshot
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            if (!vf->priv->shot)
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                vf->priv->shot=1;
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        }
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        return CONTROL_TRUE;
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    }
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    return vf_next_control (vf, request, data);
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}
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//===========================================================================//
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static int query_format(struct vf_instance *vf, unsigned int fmt)
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{
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    switch(fmt){
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    case IMGFMT_YV12:
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    case IMGFMT_I420:
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    case IMGFMT_IYUV:
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    case IMGFMT_UYVY:
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    case IMGFMT_YUY2:
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    case IMGFMT_BGR32:
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    case IMGFMT_BGR24:
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    case IMGFMT_BGR16:
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    case IMGFMT_BGR15:
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    case IMGFMT_BGR12:
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    case IMGFMT_RGB32:
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    case IMGFMT_RGB24:
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    case IMGFMT_Y800:
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    case IMGFMT_Y8:
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    case IMGFMT_YVU9:
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    case IMGFMT_IF09:
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    case IMGFMT_444P:
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    case IMGFMT_422P:
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    case IMGFMT_411P:
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        return vf_next_query_format(vf, fmt);
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    }
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    return 0;
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}
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static void uninit(vf_instance_t *vf)
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{
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    avcodec_close(vf->priv->avctx);
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    av_freep(&vf->priv->avctx);
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    if(vf->priv->ctx) sws_freeContext(vf->priv->ctx);
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    av_free(vf->priv->buffer);
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    free(vf->priv->outbuffer);
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    free(vf->priv);
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}
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static int vf_open(vf_instance_t *vf, char *args)
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{
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    vf->config=config;
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    vf->control=control;
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    vf->put_image=put_image;
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    vf->query_format=query_format;
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    vf->start_slice=start_slice;
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    vf->draw_slice=draw_slice;
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    vf->get_image=get_image;
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    vf->uninit=uninit;
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    vf->priv=malloc(sizeof(struct vf_priv_s));
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    vf->priv->frameno=0;
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    vf->priv->shot=0;
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    vf->priv->store_slices=0;
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    vf->priv->buffer=0;
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    vf->priv->outbuffer=0;
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    vf->priv->ctx=0;
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    vf->priv->avctx = avcodec_alloc_context();
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    avcodec_register_all();
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    if (avcodec_open(vf->priv->avctx, avcodec_find_encoder(CODEC_ID_PNG))) {
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        mp_msg(MSGT_VFILTER, MSGL_FATAL, "Could not open libavcodec PNG encoder\n");
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        return 0;
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    }
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    return 1;
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}
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const vf_info_t vf_info_screenshot = {
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    "screenshot to file",
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    "screenshot",
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    "A'rpi, Jindrich Makovicka",
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    "",
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    vf_open,
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    NULL
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};
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//===========================================================================//