mpv/libvo/vo_png.c

/*
 * Portable Network Graphics renderer
 *
 * Copyright 2001 by Felix Buenemann <atmosfear@users.sourceforge.net>
 *
 * Uses libpng (which uses zlib), so see according licenses.
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <png.h>

#include "config.h"
#include "mp_msg.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "video_out.h"
#include "video_out_internal.h"
#include "subopt-helper.h"

static const vo_info_t info =
{
	"PNG file",
	"png",
	"Felix Buenemann <atmosfear@users.sourceforge.net>",
	""
};

const LIBVO_EXTERN (png)

static int z_compression = Z_NO_COMPRESSION;
static int framenum = 0;
static int use_alpha;

struct pngdata {
	FILE * fp;
	png_structp png_ptr;
	png_infop info_ptr;
	enum {OK,ERROR} status;
};

static int
config(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uint32_t flags, char *title, uint32_t format)
{

	    if(z_compression == 0) {
 		    mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_PNG] Warning: compression level set to 0, compression disabled!\n");
 		    mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_PNG] Info: Use -vo png:z=<n> to set compression level from 0 to 9.\n");
 		    mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_PNG] Info: (0 = no compression, 1 = fastest, lowest - 9 best, slowest compression)\n");
	    }

    mp_msg(MSGT_VO,MSGL_DBG2, "PNG Compression level %i\n", z_compression);

    return 0;
}


static struct pngdata create_png (char * fname, int image_width, int image_height, int swapped)
{
    struct pngdata png;

    /*png_structp png_ptr = png_create_write_struct
       (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
        user_error_fn, user_warning_fn);*/
    //png_byte *row_pointers[image_height];
    png.png_ptr = png_create_write_struct
       (PNG_LIBPNG_VER_STRING, NULL,
        NULL, NULL);
    png.info_ptr = png_create_info_struct(png.png_ptr);

    if (!png.png_ptr) {
       mp_msg(MSGT_VO,MSGL_DBG2, "PNG Failed to init png pointer\n");
       png.status = ERROR;
       return png;
    }

    if (!png.info_ptr) {
       mp_msg(MSGT_VO,MSGL_DBG2, "PNG Failed to init png infopointer\n");
       png_destroy_write_struct(&png.png_ptr,
         (png_infopp)NULL);
       png.status = ERROR;
       return png;
    }

    if (setjmp(png.png_ptr->jmpbuf)) {
        mp_msg(MSGT_VO,MSGL_DBG2, "PNG Internal error!\n");
        png_destroy_write_struct(&png.png_ptr, &png.info_ptr);
        fclose(png.fp);
        png.status = ERROR;
        return png;
    }

    png.fp = fopen (fname, "wb");
    if (png.fp == NULL) {
 	mp_tmsg(MSGT_VO,MSGL_WARN, "\n[VO_PNG] Error opening '%s' for writing!\n", strerror(errno));
       	png.status = ERROR;
       	return png;
    }

    mp_msg(MSGT_VO,MSGL_DBG2, "PNG Init IO\n");
    png_init_io(png.png_ptr, png.fp);

    /* set the zlib compression level */
    png_set_compression_level(png.png_ptr, z_compression);


    /*png_set_IHDR(png_ptr, info_ptr, width, height,
       bit_depth, color_type, interlace_type,
       compression_type, filter_type)*/
    png_set_IHDR(png.png_ptr, png.info_ptr, image_width, image_height,
       8, use_alpha ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
       PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

    mp_msg(MSGT_VO,MSGL_DBG2, "PNG Write Info\n");
    png_write_info(png.png_ptr, png.info_ptr);

    if(swapped) {
        mp_msg(MSGT_VO,MSGL_DBG2, "PNG Set BGR Conversion\n");
    	png_set_bgr(png.png_ptr);
    }

    png.status = OK;
    return png;
}

static uint8_t destroy_png(struct pngdata png) {

    mp_msg(MSGT_VO,MSGL_DBG2, "PNG Write End\n");
    png_write_end(png.png_ptr, png.info_ptr);

    mp_msg(MSGT_VO,MSGL_DBG2, "PNG Destroy Write Struct\n");
    png_destroy_write_struct(&png.png_ptr, &png.info_ptr);

    fclose (png.fp);

    return 0;
}

static uint32_t draw_image(mp_image_t* mpi){
    char buf[100];
    int k;
    struct pngdata png;
    png_byte *row_pointers[mpi->h];

    // if -dr or -slices then do nothing:
    if(mpi->flags&(MP_IMGFLAG_DIRECT|MP_IMGFLAG_DRAW_CALLBACK)) return VO_TRUE;

    snprintf (buf, 100, "%08d.png", ++framenum);

    png = create_png(buf, mpi->w, mpi->h, IMGFMT_IS_BGR(mpi->imgfmt));

    if(png.status){
 	    mp_tmsg(MSGT_VO,MSGL_WARN, "[VO_PNG] Error in create_png.\n");
	    return 1;
    }

    mp_msg(MSGT_VO,MSGL_DBG2, "PNG Creating Row Pointers\n");
    for ( k = 0; k < mpi->h; k++ )
	row_pointers[k] = mpi->planes[0]+mpi->stride[0]*k;

    //png_write_flush(png.png_ptr);
    //png_set_flush(png.png_ptr, nrows);

    if( mp_msg_test(MSGT_VO,MSGL_DBG2) ) {
        mp_msg(MSGT_VO,MSGL_DBG2, "PNG Writing Image Data\n"); }
    png_write_image(png.png_ptr, row_pointers);

    destroy_png(png);

    return VO_TRUE;
}

static void draw_osd(void){}

static void flip_page (void){}

static int draw_frame(uint8_t * src[])
{
    return -1;
}

static int draw_slice( uint8_t *src[],int stride[],int w,int h,int x,int y )
{
    return -1;
}

static int
query_format(uint32_t format)
{
    const int supported_flags = VFCAP_CSP_SUPPORTED|VFCAP_CSP_SUPPORTED_BY_HW|VFCAP_ACCEPT_STRIDE;
    switch(format){
    case IMGFMT_RGB24:
    case IMGFMT_BGR24:
        return use_alpha ? 0 : supported_flags;
    case IMGFMT_RGBA:
    case IMGFMT_BGRA:
        return use_alpha ? supported_flags : 0;
    }
    return 0;
}

static void uninit(void){}

static void check_events(void){}

static int int_zero_to_nine(int *sh)
{
    if ( (*sh < 0) || (*sh > 9) )
        return 0;
    return 1;
}

static const opt_t subopts[] = {
    {"alpha", OPT_ARG_BOOL, &use_alpha, NULL},
    {"z",   OPT_ARG_INT, &z_compression, (opt_test_f)int_zero_to_nine},
    {NULL}
};

static int preinit(const char *arg)
{
    z_compression = 0;
    use_alpha = 0;
    if (subopt_parse(arg, subopts) != 0) {
        return -1;
    }
    return 0;
}

static int control(uint32_t request, void *data)
{
  switch (request) {
  case VOCTRL_DRAW_IMAGE:
    return draw_image(data);
  case VOCTRL_QUERY_FORMAT:
    return query_format(*((uint32_t*)data));
  }
  return VO_NOTIMPL;
}