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vlc/modules/codec/sdl_image.c

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/*****************************************************************************
* sdl_image.c: sdl decoder module making use of libsdl_image.
*****************************************************************************
* Copyright (C) 2005 the VideoLAN team
* $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* This program 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU 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 <vlc_vout.h>
#include SDL_IMAGE_INCLUDE_FILE
/*****************************************************************************
* decoder_sys_t : sdl decoder descriptor
*****************************************************************************/
struct decoder_sys_t
{
const char *psz_sdl_type;
};
/*****************************************************************************
* 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_shortname( N_("SDL Image decoder"))
set_description( N_("SDL_image video decoder") )
set_capability( "decoder", 60 )
set_callbacks( OpenDecoder, CloseDecoder )
add_shortcut( "sdl_image" )
vlc_module_end ()
static const struct supported_fmt_t
{
vlc_fourcc_t i_fourcc;
const char *psz_sdl_type;
} p_supported_fmt[] =
{
{ VLC_FOURCC('t','g','a',' '), "TGA" },
{ VLC_FOURCC('b','m','p',' '), "BMP" },
{ VLC_FOURCC('p','n','m',' '), "PNM" },
{ VLC_FOURCC('x','p','m',' '), "XPM" },
{ VLC_FOURCC('x','c','f',' '), "XCF" },
{ VLC_FOURCC('p','c','x',' '), "PCX" },
{ VLC_FOURCC('g','i','f',' '), "GIF" },
{ VLC_FOURCC('j','p','e','g'), "JPG" },
{ VLC_FOURCC('t','i','f','f'), "TIF" },
{ VLC_FOURCC('l','b','m',' '), "LBM" },
{ VLC_FOURCC('p','n','g',' '), "PNG" }
};
/*****************************************************************************
* OpenDecoder: probe the decoder and return score
*****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t *)p_this;
decoder_sys_t *p_sys;
int i;
/* Find codec. */
for ( i = 0;
i < (int)(sizeof(p_supported_fmt)/sizeof(struct supported_fmt_t));
i++ )
{
if ( p_supported_fmt[i].i_fourcc == p_dec->fmt_in.i_codec )
break;
}
if ( i == (int)(sizeof(p_supported_fmt)/sizeof(struct supported_fmt_t)) )
{
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_dec->p_sys = p_sys =
(decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
return VLC_ENOMEM;
p_sys->psz_sdl_type = p_supported_fmt[i].psz_sdl_type;
/* Set output properties - this is a decoy and isn't used anywhere */
p_dec->fmt_out.i_cat = VIDEO_ES;
p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','3','2');
/* Set callbacks */
p_dec->pf_decode_video = DecodeBlock;
return VLC_SUCCESS;
}
/****************************************************************************
* DecodeBlock: the whole thing
****************************************************************************
* This function must be fed with a complete compressed frame.
****************************************************************************/
static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
picture_t *p_pic = NULL;
SDL_Surface *p_surface;
SDL_RWops *p_rw;
if( pp_block == NULL || *pp_block == NULL ) return NULL;
p_block = *pp_block;
if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY )
{
block_Release( p_block ); *pp_block = NULL;
return NULL;
}
p_rw = SDL_RWFromConstMem( p_block->p_buffer, p_block->i_buffer );
/* Decode picture. */
p_surface = IMG_LoadTyped_RW( p_rw, 1, (char*)p_sys->psz_sdl_type );
if ( p_surface == NULL )
{
msg_Warn( p_dec, "SDL_image couldn't load the image (%s)",
IMG_GetError() );
goto error;
}
switch ( p_surface->format->BitsPerPixel )
{
case 16:
p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','1','6');
break;
case 8:
case 24:
p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','2','4');
break;
case 32:
p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','3','2');
break;
default:
msg_Warn( p_dec, "unknown bits/pixel format (%d)",
p_surface->format->BitsPerPixel );
goto error;
}
p_dec->fmt_out.video.i_width = p_surface->w;
p_dec->fmt_out.video.i_height = p_surface->h;
p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * p_surface->w
/ p_surface->h;
/* Get a new picture. */
p_pic = decoder_NewPicture( p_dec );
if ( p_pic == NULL ) goto error;
switch ( p_surface->format->BitsPerPixel )
{
case 8:
{
int i, j;
uint8_t *p_src, *p_dst;
uint8_t r, g, b;
for ( i = 0; i < p_surface->h; i++ )
{
p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
for ( j = 0; j < p_surface->w; j++ )
{
SDL_GetRGB( *(p_src++), p_surface->format,
&r, &g, &b );
*(p_dst++) = r;
*(p_dst++) = g;
*(p_dst++) = b;
}
}
break;
}
case 16:
{
int i;
uint8_t *p_src = p_surface->pixels;
uint8_t *p_dst = p_pic->p[0].p_pixels;
int i_pitch = p_pic->p[0].i_pitch < p_surface->pitch ?
p_pic->p[0].i_pitch : p_surface->pitch;
for ( i = 0; i < p_surface->h; i++ )
{
vlc_memcpy( p_dst, p_src, i_pitch );
p_src += p_surface->pitch;
p_dst += p_pic->p[0].i_pitch;
}
break;
}
case 24:
{
int i, j;
uint8_t *p_src, *p_dst;
uint8_t r, g, b;
for ( i = 0; i < p_surface->h; i++ )
{
p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
for ( j = 0; j < p_surface->w; j++ )
{
SDL_GetRGB( *(uint32_t*)p_src, p_surface->format,
&r, &g, &b );
*(p_dst++) = r;
*(p_dst++) = g;
*(p_dst++) = b;
p_src += 3;
}
}
break;
}
case 32:
{
int i, j;
uint8_t *p_src, *p_dst;
uint8_t r, g, b, a;
for ( i = 0; i < p_surface->h; i++ )
{
p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
for ( j = 0; j < p_surface->w; j++ )
{
SDL_GetRGBA( *(uint32_t*)p_src, p_surface->format,
&r, &g, &b, &a );
*(p_dst++) = b;
*(p_dst++) = g;
*(p_dst++) = r;
*(p_dst++) = a;
p_src += 4;
}
}
break;
}
}
p_pic->date = p_block->i_pts > 0 ? p_block->i_pts : p_block->i_dts;
SDL_FreeSurface( p_surface );
block_Release( p_block ); *pp_block = NULL;
return p_pic;
error:
if ( p_surface != NULL ) SDL_FreeSurface( p_surface );
block_Release( p_block ); *pp_block = NULL;
return NULL;
}
/*****************************************************************************
* CloseDecoder: sdl decoder destruction
*****************************************************************************/
static void CloseDecoder( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t *)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
free( p_sys );
}
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