Commit 96888e87 authored by Adam Leggett's avatar Adam Leggett Committed by Jean-Paul Saman

codec/svg.c: Add svg decoder.

parent c03344e9
/*****************************************************************************
* svg.c: svg decoder module making use of librsvg2.
*****************************************************************************
* Copyright (C) 2014 VLC authors and VideoLAN
*
* Authors: Adam Leggett <adamvleggett@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <glib-object.h> /* g_object_unref( ) */
#include <librsvg/rsvg.h>
#include <cairo/cairo.h>
/*****************************************************************************
* decoder_sys_t : svg decoder descriptor
*****************************************************************************/
struct decoder_sys_t
{
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int OpenDecoder ( vlc_object_t * );
static void CloseDecoder ( vlc_object_t * );
static picture_t *DecodeBlock ( decoder_t *, block_t ** );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_VCODEC )
set_description( N_("SVG video decoder") )
set_capability( "decoder", 100 )
set_callbacks( OpenDecoder, CloseDecoder )
add_shortcut( "svg" )
vlc_module_end ()
/*****************************************************************************
* OpenDecoder: probe the decoder and return score
*****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
if( p_dec->fmt_in.i_codec != VLC_CODEC_SVG )
{
return VLC_EGENERIC;
}
/* Initialize library */
rsvg_init();
/* Set output properties */
p_dec->fmt_out.i_cat = VIDEO_ES;
p_dec->fmt_out.i_codec = VLC_CODEC_RGBA;
/* Set callbacks */
p_dec->pf_decode_video = DecodeBlock;
return VLC_SUCCESS;
}
static void rsvg_cairo_size_callback(int *width, int *height, gpointer data)
{
RsvgDimensionData *dim = data;
*width = dim->width;
*height = dim->height;
}
/****************************************************************************
* DecodeBlock: the whole thing
****************************************************************************
* This function must be fed with a complete image.
****************************************************************************/
static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
block_t *p_block;
picture_t *p_pic = NULL;
RsvgHandle *rsvg = NULL;
cairo_surface_t *surface = NULL;
cairo_t *cr = NULL;
int stride = 0;
if( !pp_block || !*pp_block ) return NULL;
p_block = *pp_block;
*pp_block = NULL;
if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY )
{
block_Release( p_block );
return NULL;
}
rsvg = rsvg_handle_new_from_data(p_block->p_buffer, p_block->i_buffer, NULL);
if( !rsvg )
goto done;
RsvgDimensionData dim;
rsvg_handle_get_dimensions(rsvg, &dim);
rsvg_handle_set_size_callback(rsvg, rsvg_cairo_size_callback, &dim, NULL);
p_dec->fmt_out.i_codec = VLC_CODEC_RGBA;
p_dec->fmt_out.video.i_width = dim.width;
p_dec->fmt_out.video.i_height = dim.height;
p_dec->fmt_out.video.i_sar_num = 1;
p_dec->fmt_out.video.i_sar_den = 1;
p_dec->fmt_out.video.i_rmask = 0x000000ff;
p_dec->fmt_out.video.i_gmask = 0x0000ff00;
p_dec->fmt_out.video.i_bmask = 0x00ff0000;
/* Get a new picture */
p_pic = decoder_NewPicture( p_dec );
if( !p_pic )
goto done;
stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, dim.width);
surface = cairo_image_surface_create_for_data(p_pic->p->p_pixels,
CAIRO_FORMAT_ARGB32,
dim.width, dim.height,
stride);
if( !surface )
{
p_pic = NULL;
goto done;
}
/* Decode picture */
cr = cairo_create(surface);
if( !cr )
{
p_pic = NULL;
goto done;
}
rsvg_handle_render_cairo(rsvg, cr);
p_pic->date = p_block->i_pts > VLC_TS_INVALID ? p_block->i_pts : p_block->i_dts;
done:
if( rsvg )
g_object_unref( G_OBJECT( rsvg ) );
if( cr )
cairo_destroy( cr );
if( surface )
cairo_surface_destroy( surface );
block_Release( p_block );
return p_pic;
}
/*****************************************************************************
* CloseDecoder: png decoder destruction
*****************************************************************************/
static void CloseDecoder( vlc_object_t *p_this )
{
VLC_UNUSED( p_this );
rsvg_term();
}
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