mpv/libmpcodecs/vf_screenshot.c

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#include "config.h"
#ifdef HAVE_PNG
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <png.h>
#include "mp_msg.h"
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#include "vf_scale.h"
#include "libvo/fastmemcpy.h"
#include "postproc/swscale.h"
#include "postproc/rgb2rgb.h"
struct vf_priv_s {
int frameno;
char fname[102];
int shot, store_slices;
int dw, dh, stride;
uint8_t *buffer;
struct SwsContext *ctx;
};
//===========================================================================//
static int config(struct vf_instance_s* vf,
int width, int height, int d_width, int d_height,
unsigned int flags, unsigned int outfmt)
{
vf->priv->ctx=sws_getContextFromCmdLine(width, height, outfmt,
d_width, d_height, IMGFMT_BGR24);
vf->priv->dw = d_width;
vf->priv->dh = d_height;
vf->priv->stride = (3*vf->priv->dw+15)&~15;
if (vf->priv->buffer) free(vf->priv->buffer); // probably reconfigured
vf->priv->buffer = NULL;
return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}
static int write_png(char *fname, unsigned char *buffer, int width, int height, int stride)
{
FILE * fp;
png_structp png_ptr;
png_infop info_ptr;
png_byte **row_pointers;
int k;
png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
fp = NULL;
if (setjmp(png_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
return 0;
}
fp = fopen (fname, "wb");
if (fp == NULL) {
mp_msg(MSGT_VFILTER,MSGL_ERR,"\nPNG Error opening %s for writing!\n", fname);
return 0;
}
png_init_io(png_ptr, fp);
png_set_compression_level(png_ptr, 0);
png_set_IHDR(png_ptr, info_ptr, width, height,
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
png_set_bgr(png_ptr);
row_pointers = (png_byte**)malloc(height*sizeof(png_byte*));
for (k = 0; k < height; k++) {
unsigned char* s=buffer + stride*k;
row_pointers[k] = s;
}
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
free(row_pointers);
fclose (fp);
}
static int fexists(char *fname)
{
struct stat dummy;
if (stat(fname, &dummy) == 0) return 1;
else return 0;
}
static void gen_fname(struct vf_priv_s* priv)
{
do {
snprintf (priv->fname, 100, "shot%04d.png", ++priv->frameno);
} while (fexists(priv->fname) && priv->frameno < 100000);
if (fexists(priv->fname)) {
priv->fname[0] = '\0';
return;
}
mp_msg(MSGT_VFILTER,MSGL_INFO,"*** screenshot '%s' ***\n",priv->fname);
}
static void scale_image(struct vf_priv_s* priv, mp_image_t *mpi)
{
uint8_t *dst[3];
int dst_stride[3];
dst_stride[0] = priv->stride;
dst_stride[1] = dst_stride[2] = 0;
if (!priv->buffer)
priv->buffer = (uint8_t*)memalign(16, dst_stride[0]*priv->dh);
dst[0] = priv->buffer;
dst[1] = dst[2] = 0;
sws_scale_ordered(priv->ctx, mpi->planes, mpi->stride, 0, mpi->height, dst, dst_stride);
}
static void start_slice(struct vf_instance_s* 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->buffer)
vf->priv->buffer = (uint8_t*)memalign(16, vf->priv->stride*vf->priv->dh);
}
}
static void draw_slice(struct vf_instance_s* vf,
unsigned char** src, int* stride, int w,int h, int x, int y){
if (vf->priv->store_slices) {
uint8_t *dst[3];
int dst_stride[3];
dst_stride[0] = vf->priv->stride;
dst_stride[1] = dst_stride[2] = 0;
dst[0] = vf->priv->buffer;
dst[1] = dst[2] = 0;
sws_scale_ordered(vf->priv->ctx, src, stride, y, h, dst, dst_stride);
}
vf_next_draw_slice(vf,src,stride,w,h,x,y);
}
static void get_image(struct vf_instance_s* 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);
mpi->planes[0]=vf->dmpi->planes[0];
mpi->stride[0]=vf->dmpi->stride[0];
if(mpi->flags&MP_IMGFLAG_PLANAR){
mpi->planes[1]=vf->dmpi->planes[1];
mpi->planes[2]=vf->dmpi->planes[2];
mpi->stride[1]=vf->dmpi->stride[1];
mpi->stride[2]=vf->dmpi->stride[2];
}
mpi->width=vf->dmpi->width;
mpi->flags|=MP_IMGFLAG_DIRECT;
mpi->priv=(void*)vf->dmpi;
}
static int put_image(struct vf_instance_s* 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);
dmpi->planes[0]=mpi->planes[0];
dmpi->planes[1]=mpi->planes[1];
dmpi->planes[2]=mpi->planes[2];
dmpi->stride[0]=mpi->stride[0];
dmpi->stride[1]=mpi->stride[1];
dmpi->stride[2]=mpi->stride[2];
dmpi->width=mpi->width;
dmpi->height=mpi->height;
}
if(vf->priv->shot) {
vf->priv->shot=0;
gen_fname(vf->priv);
if (vf->priv->fname[0]) {
if (!vf->priv->store_slices)
scale_image(vf->priv, dmpi);
write_png(vf->priv->fname, vf->priv->buffer, vf->priv->dw, vf->priv->dh, vf->priv->stride);
}
vf->priv->store_slices = 0;
}
return vf_next_put_image(vf, dmpi, pts);
}
int control (vf_instance_t *vf, int request, void *data)
{
if(request==VFCTRL_SCREENSHOT) {
vf->priv->shot=1;
return CONTROL_TRUE;
}
return vf_next_control (vf, request, data);
}
//===========================================================================//
static int query_format(struct vf_instance_s* vf, unsigned int fmt)
{
switch(fmt){
case IMGFMT_YV12:
case IMGFMT_I420:
case IMGFMT_IYUV:
case IMGFMT_UYVY:
case IMGFMT_YUY2:
case IMGFMT_BGR32:
case IMGFMT_BGR24:
case IMGFMT_BGR16:
case IMGFMT_BGR15:
case IMGFMT_RGB32:
case IMGFMT_RGB24:
case IMGFMT_Y800:
case IMGFMT_Y8:
case IMGFMT_YVU9:
case IMGFMT_IF09:
case IMGFMT_444P:
case IMGFMT_422P:
case IMGFMT_411P:
return vf_next_query_format(vf, fmt);
}
return 0;
}
static void uninit(vf_instance_t *vf);
// open conflicts with stdio.h at least under MinGW
static int screenshot_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->frameno=0;
vf->priv->shot=0;
vf->priv->store_slices=0;
vf->priv->buffer=0;
vf->priv->ctx=0;
return 1;
}
static void uninit(vf_instance_t *vf)
{
if(vf->priv->ctx) sws_freeContext(vf->priv->ctx);
if (vf->priv->buffer) free(vf->priv->buffer);
free(vf->priv);
}
vf_info_t vf_info_screenshot = {
"screenshot to file",
"screenshot",
"A'rpi, Jindrich Makovicka",
"",
screenshot_open,
NULL
};
//===========================================================================//
#endif /* HAVE_PNG */