git.sesse.net Git - vlc/blob - 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc/decoder.h>
  29
  30 #include SDL_IMAGE_INCLUDE_FILE
  31
  32 /*****************************************************************************
  33  * decoder_sys_t : sdl decoder descriptor
  34  *****************************************************************************/
  35 struct decoder_sys_t
  36 {
  37     const char *psz_sdl_type;
  38 };
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  OpenDecoder   ( vlc_object_t * );
  44 static void CloseDecoder  ( vlc_object_t * );
  45
  46 static picture_t *DecodeBlock  ( decoder_t *, block_t ** );
  47
  48 /*****************************************************************************
  49  * Module descriptor
  50  *****************************************************************************/
  51 vlc_module_begin();
  52     set_category( CAT_INPUT );
  53     set_subcategory( SUBCAT_INPUT_VCODEC );
  54     set_description( _("SDL_image video decoder") );
  55     set_capability( "decoder", 900 );
  56     set_callbacks( OpenDecoder, CloseDecoder );
  57     add_shortcut( "sdl_image" );
  58 vlc_module_end();
  59
  60 static const struct supported_fmt_t
  61 {
  62     vlc_fourcc_t i_fourcc;
  63     char *psz_sdl_type;
  64 } p_supported_fmt[] =
  65 {
  66     { VLC_FOURCC('t','g','a',' '), "TGA" },
  67     { VLC_FOURCC('b','m','p',' '), "BMP" },
  68     { VLC_FOURCC('p','n','m',' '), "PNM" },
  69     { VLC_FOURCC('x','p','m',' '), "XPM" },
  70     { VLC_FOURCC('x','c','f',' '), "XCF" },
  71     { VLC_FOURCC('p','c','x',' '), "PCX" },
  72     { VLC_FOURCC('g','i','f',' '), "GIF" },
  73     { VLC_FOURCC('j','p','e','g'), "JPG" },
  74     { VLC_FOURCC('t','i','f','f'), "TIF" },
  75     { VLC_FOURCC('l','b','m',' '), "LBM" },
  76     { VLC_FOURCC('p','n','g',' '), "PNG" }
  77 };
  78
  79 /*****************************************************************************
  80  * OpenDecoder: probe the decoder and return score
  81  *****************************************************************************/
  82 static int OpenDecoder( vlc_object_t *p_this )
  83 {
  84     decoder_t *p_dec = (decoder_t *)p_this;
  85     decoder_sys_t *p_sys;
  86     int i;
  87
  88     /* Find codec. */
  89     for ( i = 0;
  90           i < (int)(sizeof(p_supported_fmt)/sizeof(struct supported_fmt_t));
  91           i++ )
  92     {
  93         if ( p_supported_fmt[i].i_fourcc == p_dec->fmt_in.i_codec )
  94             break;
  95     }
  96     if ( i == (int)(sizeof(p_supported_fmt)/sizeof(struct supported_fmt_t)) )
  97     {
  98         return VLC_EGENERIC;
  99     }
 100
 101     /* Allocate the memory needed to store the decoder's structure */
 102     if( ( p_dec->p_sys = p_sys =
 103           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 104     {
 105         msg_Err( p_dec, "out of memory" );
 106         return VLC_EGENERIC;
 107     }
 108     p_sys->psz_sdl_type = p_supported_fmt[i].psz_sdl_type;
 109
 110     /* Set output properties - this is a decoy and isn't used anywhere */
 111     p_dec->fmt_out.i_cat = VIDEO_ES;
 112     p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','3','2');
 113
 114     /* Set callbacks */
 115     p_dec->pf_decode_video = DecodeBlock;
 116
 117     return VLC_SUCCESS;
 118 }
 119
 120 /****************************************************************************
 121  * DecodeBlock: the whole thing
 122  ****************************************************************************
 123  * This function must be fed with a complete compressed frame.
 124  ****************************************************************************/
 125 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 126 {
 127     decoder_sys_t *p_sys = p_dec->p_sys;
 128     block_t *p_block;
 129     picture_t *p_pic = NULL;
 130     SDL_Surface *p_surface;
 131     SDL_RWops *p_rw;
 132
 133     if( pp_block == NULL || *pp_block == NULL ) return NULL;
 134     p_block = *pp_block;
 135
 136     p_rw = SDL_RWFromConstMem( p_block->p_buffer, p_block->i_buffer );
 137
 138     /* Decode picture. */
 139     p_surface = IMG_LoadTyped_RW( p_rw, 1, (char*)p_sys->psz_sdl_type );
 140     if ( p_surface == NULL )
 141     {
 142         msg_Warn( p_dec, "SDL_image couldn't load the image (%s)",
 143                   IMG_GetError() );
 144         goto error;
 145     }
 146
 147     switch ( p_surface->format->BitsPerPixel )
 148     {
 149     case 16:
 150         p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','1','6');
 151         break;
 152     case 8:
 153     case 24:
 154         p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','2','4');
 155         break;
 156     case 32:
 157         p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','3','2');
 158         break;
 159     default:
 160         msg_Warn( p_dec, "unknown bits/pixel format (%d)",
 161                   p_surface->format->BitsPerPixel );
 162         goto error;
 163     }
 164     p_dec->fmt_out.video.i_width = p_surface->w;
 165     p_dec->fmt_out.video.i_height = p_surface->h;
 166     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * p_surface->w
 167                                      / p_surface->h;
 168
 169     /* Get a new picture. */
 170     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 171     if ( p_pic == NULL ) goto error;
 172
 173     switch ( p_surface->format->BitsPerPixel )
 174     {
 175         case 8:
 176         {
 177             int i, j;
 178             uint8_t *r = p_pic->p[0].p_pixels;
 179             uint8_t *g = p_pic->p[0].p_pixels + 1;
 180             uint8_t *b = p_pic->p[0].p_pixels + 2;
 181             SDL_Palette *p_palette = p_surface->format->palette;
 182
 183             for ( i = 0; i < p_surface->h; i++ )
 184             {
 185                 for ( j = 0; j < p_surface->w; j++ )
 186                 {
 187                     uint8_t i_index = ((uint8_t *)p_surface->pixels)[j];
 188                     SDL_Color *p_color = &p_palette->colors[i_index];
 189                     r[j] = p_color->r;
 190                     g[j] = p_color->g;
 191                     b[j] = p_color->b;
 192                 }
 193             }
 194             r += p_pic->p[0].i_pitch;
 195             g += p_pic->p[0].i_pitch;
 196             b += p_pic->p[0].i_pitch;
 197             break;
 198         }
 199         case 16:
 200         {
 201             int i;
 202             uint8_t *p_src = p_surface->pixels;
 203             uint8_t *p_dst = p_pic->p[0].p_pixels;
 204             int i_pitch = p_pic->p[0].i_pitch < p_surface->pitch ?
 205                 p_pic->p[0].i_pitch : p_surface->pitch;
 206
 207             for ( i = 0; i < p_surface->h; i++ )
 208             {
 209                 p_dec->p_vlc->pf_memcpy( p_dst, p_src, i_pitch );
 210                 p_src += p_surface->pitch;
 211                 p_dst += p_pic->p[0].i_pitch;
 212             }
 213             break;
 214         }
 215         case 24:
 216         {
 217             int i, j;
 218             uint8_t *p_src, *p_dst;
 219             uint8_t r, g, b;
 220             for ( i = 0; i < p_surface->h; i++ )
 221             {
 222                 p_src = p_surface->pixels + i * p_surface->pitch;
 223                 p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 224                 for ( j = 0; j < p_surface->w; j++ )
 225                 {
 226                     SDL_GetRGB( *(uint32_t*)p_src, p_surface->format,
 227                                 &r, &g, &b );
 228                     *(p_dst++) = r;
 229                     *(p_dst++) = g;
 230                     *(p_dst++) = b;
 231                     p_src += 3;
 232                 }
 233             }
 234             break;
 235         }
 236         case 32:
 237         {
 238             int i, j;
 239             uint8_t *p_src, *p_dst;
 240             uint8_t r, g, b, a;
 241             for ( i = 0; i < p_surface->h; i++ )
 242             {
 243                 p_src = p_surface->pixels + i * p_surface->pitch;
 244                 p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 245                 for ( j = 0; j < p_surface->w; j++ )
 246                 {
 247                     SDL_GetRGBA( *(uint32_t*)p_src, p_surface->format,
 248                                 &r, &g, &b, &a );
 249                     *(p_dst++) = b;
 250                     *(p_dst++) = g;
 251                     *(p_dst++) = r;
 252                     *(p_dst++) = a;
 253                     p_src += 4;
 254                 }
 255             }
 256             break;
 257         }
 258     }
 259
 260     SDL_FreeSurface( p_surface );
 261     block_Release( p_block ); *pp_block = NULL;
 262     return p_pic;
 263
 264 error:
 265     if ( p_surface != NULL ) SDL_FreeSurface( p_surface );
 266     block_Release( p_block ); *pp_block = NULL;
 267     return NULL;
 268 }
 269
 270 /*****************************************************************************
 271  * CloseDecoder: sdl decoder destruction
 272  *****************************************************************************/
 273 static void CloseDecoder( vlc_object_t *p_this )
 274 {
 275     decoder_t *p_dec = (decoder_t *)p_this;
 276     decoder_sys_t *p_sys = p_dec->p_sys;
 277
 278     free( p_sys );
 279 }