modules/codec/sdl_image.c

   1 /*****************************************************************************
   2  * sdl_image.c: sdl decoder module making use of libsdl_image.
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_codec.h>
  35
  36 #include <SDL_image.h>
  37
  38 /*****************************************************************************
  39  * decoder_sys_t : sdl decoder descriptor
  40  *****************************************************************************/
  41 struct decoder_sys_t
  42 {
  43     const char *psz_sdl_type;
  44 };
  45
  46 /*****************************************************************************
  47  * Local prototypes
  48  *****************************************************************************/
  49 static int  OpenDecoder   ( vlc_object_t * );
  50 static void CloseDecoder  ( vlc_object_t * );
  51
  52 static picture_t *DecodeBlock  ( decoder_t *, block_t ** );
  53
  54 /*****************************************************************************
  55  * Module descriptor
  56  *****************************************************************************/
  57 vlc_module_begin ()
  58     set_category( CAT_INPUT )
  59     set_subcategory( SUBCAT_INPUT_VCODEC )
  60     set_shortname( N_("SDL Image decoder"))
  61     set_description( N_("SDL_image video decoder") )
  62     set_capability( "decoder", 60 )
  63     set_callbacks( OpenDecoder, CloseDecoder )
  64     add_shortcut( "sdl_image" )
  65 vlc_module_end ()
  66
  67 static const struct supported_fmt_t
  68 {
  69     vlc_fourcc_t i_fourcc;
  70     const char *psz_sdl_type;
  71 } p_supported_fmt[] =
  72 {
  73     { VLC_CODEC_TARGA, "TGA" },
  74     { VLC_CODEC_BMP, "BMP" },
  75     { VLC_CODEC_PNM, "PNM" },
  76     { VLC_FOURCC('x','p','m',' '), "XPM" },
  77     { VLC_FOURCC('x','c','f',' '), "XCF" },
  78     { VLC_CODEC_PCX, "PCX" },
  79     { VLC_CODEC_GIF, "GIF" },
  80     { VLC_CODEC_JPEG, "JPG" },
  81     { VLC_CODEC_TIFF, "TIF" },
  82     { VLC_FOURCC('l','b','m',' '), "LBM" },
  83     { VLC_CODEC_PNG, "PNG" }
  84 };
  85
  86 /*****************************************************************************
  87  * OpenDecoder: probe the decoder and return score
  88  *****************************************************************************/
  89 static int OpenDecoder( vlc_object_t *p_this )
  90 {
  91     decoder_t *p_dec = (decoder_t *)p_this;
  92     decoder_sys_t *p_sys;
  93     int i;
  94
  95     /* Find codec. */
  96     for ( i = 0;
  97           i < (int)(sizeof(p_supported_fmt)/sizeof(struct supported_fmt_t));
  98           i++ )
  99     {
 100         if ( p_supported_fmt[i].i_fourcc == p_dec->fmt_in.i_codec )
 101             break;
 102     }
 103     if ( i == (int)(sizeof(p_supported_fmt)/sizeof(struct supported_fmt_t)) )
 104     {
 105         return VLC_EGENERIC;
 106     }
 107
 108     /* Allocate the memory needed to store the decoder's structure */
 109     if( ( p_dec->p_sys = p_sys =
 110           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 111         return VLC_ENOMEM;
 112     p_sys->psz_sdl_type = p_supported_fmt[i].psz_sdl_type;
 113
 114     /* Set output properties - this is a decoy and isn't used anywhere */
 115     p_dec->fmt_out.i_cat = VIDEO_ES;
 116     p_dec->fmt_out.i_codec = VLC_CODEC_RGB32;
 117
 118     /* Set callbacks */
 119     p_dec->pf_decode_video = DecodeBlock;
 120
 121     return VLC_SUCCESS;
 122 }
 123
 124 /****************************************************************************
 125  * DecodeBlock: the whole thing
 126  ****************************************************************************
 127  * This function must be fed with a complete compressed frame.
 128  ****************************************************************************/
 129 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 130 {
 131     decoder_sys_t *p_sys = p_dec->p_sys;
 132     block_t *p_block;
 133     picture_t *p_pic = NULL;
 134     SDL_Surface *p_surface;
 135     SDL_RWops *p_rw;
 136
 137     if( pp_block == NULL || *pp_block == NULL ) return NULL;
 138     p_block = *pp_block;
 139
 140     if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY )
 141     {
 142         block_Release( p_block ); *pp_block = NULL;
 143         return NULL;
 144     }
 145
 146     p_rw = SDL_RWFromConstMem( p_block->p_buffer, p_block->i_buffer );
 147
 148     /* Decode picture. */
 149     p_surface = IMG_LoadTyped_RW( p_rw, 1, (char*)p_sys->psz_sdl_type );
 150     if ( p_surface == NULL )
 151     {
 152         msg_Warn( p_dec, "SDL_image couldn't load the image (%s)",
 153                   IMG_GetError() );
 154         goto error;
 155     }
 156
 157     switch ( p_surface->format->BitsPerPixel )
 158     {
 159     case 16:
 160         p_dec->fmt_out.i_codec = VLC_CODEC_RGB16;
 161         break;
 162     case 8:
 163     case 24:
 164         p_dec->fmt_out.i_codec = VLC_CODEC_RGB24;
 165         break;
 166     case 32:
 167         p_dec->fmt_out.i_codec = VLC_CODEC_RGB32;
 168         break;
 169     default:
 170         msg_Warn( p_dec, "unknown bits/pixel format (%d)",
 171                   p_surface->format->BitsPerPixel );
 172         goto error;
 173     }
 174     p_dec->fmt_out.video.i_width = p_surface->w;
 175     p_dec->fmt_out.video.i_height = p_surface->h;
 176     p_dec->fmt_out.video.i_sar_num = 1;
 177     p_dec->fmt_out.video.i_sar_den = 1;
 178
 179     /* Get a new picture. */
 180     p_pic = decoder_NewPicture( p_dec );
 181     if ( p_pic == NULL ) goto error;
 182
 183     switch ( p_surface->format->BitsPerPixel )
 184     {
 185         case 8:
 186         {
 187             int i, j;
 188             uint8_t *p_src, *p_dst;
 189             uint8_t r, g, b;
 190             for ( i = 0; i < p_surface->h; i++ )
 191             {
 192                 p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
 193                 p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 194                 for ( j = 0; j < p_surface->w; j++ )
 195                 {
 196                     SDL_GetRGB( *(p_src++), p_surface->format,
 197                                 &r, &g, &b );
 198                     *(p_dst++) = r;
 199                     *(p_dst++) = g;
 200                     *(p_dst++) = b;
 201                 }
 202             }
 203             break;
 204         }
 205         case 16:
 206         {
 207             int i;
 208             uint8_t *p_src = p_surface->pixels;
 209             uint8_t *p_dst = p_pic->p[0].p_pixels;
 210             int i_pitch = p_pic->p[0].i_pitch < p_surface->pitch ?
 211                 p_pic->p[0].i_pitch : p_surface->pitch;
 212
 213             for ( i = 0; i < p_surface->h; i++ )
 214             {
 215                 vlc_memcpy( p_dst, p_src, i_pitch );
 216                 p_src += p_surface->pitch;
 217                 p_dst += p_pic->p[0].i_pitch;
 218             }
 219             break;
 220         }
 221         case 24:
 222         {
 223             int i, j;
 224             uint8_t *p_src, *p_dst;
 225             uint8_t r, g, b;
 226             for ( i = 0; i < p_surface->h; i++ )
 227             {
 228                 p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
 229                 p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 230                 for ( j = 0; j < p_surface->w; j++ )
 231                 {
 232                     SDL_GetRGB( *(uint32_t*)p_src, p_surface->format,
 233                                 &r, &g, &b );
 234                     *(p_dst++) = r;
 235                     *(p_dst++) = g;
 236                     *(p_dst++) = b;
 237                     p_src += 3;
 238                 }
 239             }
 240             break;
 241         }
 242         case 32:
 243         {
 244             int i, j;
 245             uint8_t *p_src, *p_dst;
 246             uint8_t r, g, b, a;
 247             for ( i = 0; i < p_surface->h; i++ )
 248             {
 249                 p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
 250                 p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 251                 for ( j = 0; j < p_surface->w; j++ )
 252                 {
 253                     SDL_GetRGBA( *(uint32_t*)p_src, p_surface->format,
 254                                 &r, &g, &b, &a );
 255                     *(p_dst++) = b;
 256                     *(p_dst++) = g;
 257                     *(p_dst++) = r;
 258                     *(p_dst++) = a;
 259                     p_src += 4;
 260                 }
 261             }
 262             break;
 263         }
 264     }
 265
 266     p_pic->date = (p_block->i_pts > VLC_TS_INVALID) ?
 267         p_block->i_pts : p_block->i_dts;
 268
 269     SDL_FreeSurface( p_surface );
 270     block_Release( p_block ); *pp_block = NULL;
 271     return p_pic;
 272
 273 error:
 274     if ( p_surface != NULL ) SDL_FreeSurface( p_surface );
 275     block_Release( p_block ); *pp_block = NULL;
 276     return NULL;
 277 }
 278
 279 /*****************************************************************************
 280  * CloseDecoder: sdl decoder destruction
 281  *****************************************************************************/
 282 static void CloseDecoder( vlc_object_t *p_this )
 283 {
 284     decoder_t *p_dec = (decoder_t *)p_this;
 285     decoder_sys_t *p_sys = p_dec->p_sys;
 286
 287     free( p_sys );
 288 }