modules/codec/sdl_image.c

   1 /*****************************************************************************
   2  * sdl_image.c: sdl decoder module making use of libsdl_image.
   3  *****************************************************************************
   4  * Copyright (C) 2005 VLC authors and VideoLAN
   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 it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * 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 typedef struct
  42 {
  43     const char *psz_sdl_type;
  44 } decoder_sys_t;
  45
  46 /*****************************************************************************
  47  * Local prototypes
  48  *****************************************************************************/
  49 static int  OpenDecoder   ( vlc_object_t * );
  50 static void CloseDecoder  ( vlc_object_t * );
  51
  52 static int 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( "video 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_codec = VLC_CODEC_RGB32;
 116
 117     /* Set callbacks */
 118     p_dec->pf_decode = DecodeBlock;
 119
 120     return VLC_SUCCESS;
 121 }
 122
 123 /****************************************************************************
 124  * DecodeBlock: the whole thing
 125  ****************************************************************************
 126  * This function must be fed with a complete compressed frame.
 127  ****************************************************************************/
 128 static int DecodeBlock( decoder_t *p_dec, block_t *p_block )
 129 {
 130     decoder_sys_t *p_sys = p_dec->p_sys;
 131     picture_t *p_pic = NULL;
 132     SDL_Surface *p_surface;
 133     SDL_RWops *p_rw;
 134
 135     if( p_block == NULL ) /* No Drain */
 136         return VLCDEC_SUCCESS;
 137
 138     if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
 139     {
 140         block_Release( p_block );
 141         return VLCDEC_SUCCESS;
 142     }
 143
 144     p_rw = SDL_RWFromConstMem( p_block->p_buffer, p_block->i_buffer );
 145
 146     /* Decode picture. */
 147     p_surface = IMG_LoadTyped_RW( p_rw, 1, (char*)p_sys->psz_sdl_type );
 148     if ( p_surface == NULL )
 149     {
 150         msg_Warn( p_dec, "SDL_image couldn't load the image (%s)",
 151                   IMG_GetError() );
 152         goto error;
 153     }
 154
 155     switch ( p_surface->format->BitsPerPixel )
 156     {
 157     case 16:
 158         p_dec->fmt_out.i_codec = VLC_CODEC_RGB16;
 159         break;
 160     case 8:
 161     case 24:
 162         p_dec->fmt_out.i_codec = VLC_CODEC_RGB24;
 163         break;
 164     case 32:
 165         p_dec->fmt_out.i_codec = VLC_CODEC_RGB32;
 166         break;
 167     default:
 168         msg_Warn( p_dec, "unknown bits/pixel format (%d)",
 169                   p_surface->format->BitsPerPixel );
 170         goto error;
 171     }
 172     p_dec->fmt_out.video.i_width = p_surface->w;
 173     p_dec->fmt_out.video.i_height = p_surface->h;
 174     p_dec->fmt_out.video.i_sar_num = 1;
 175     p_dec->fmt_out.video.i_sar_den = 1;
 176
 177     /* Get a new picture. */
 178     if( decoder_UpdateVideoFormat( p_dec ) )
 179         goto error;
 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             for ( int i = 0; i < p_surface->h; i++ )
 188             {
 189                 uint8_t *p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
 190                 uint8_t *p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 191                 for ( int j = 0; j < p_surface->w; j++ )
 192                 {
 193                     uint8_t r, g, b;
 194                     SDL_GetRGB( *(p_src++), p_surface->format,
 195                                 &r, &g, &b );
 196                     *(p_dst++) = r;
 197                     *(p_dst++) = g;
 198                     *(p_dst++) = b;
 199                 }
 200             }
 201             break;
 202         }
 203         case 16:
 204         {
 205             uint8_t *p_src = p_surface->pixels;
 206             uint8_t *p_dst = p_pic->p[0].p_pixels;
 207             int i_pitch = p_pic->p[0].i_pitch < p_surface->pitch ?
 208                 p_pic->p[0].i_pitch : p_surface->pitch;
 209
 210             for ( int i = 0; i < p_surface->h; i++ )
 211             {
 212                 memcpy( p_dst, p_src, i_pitch );
 213                 p_src += p_surface->pitch;
 214                 p_dst += p_pic->p[0].i_pitch;
 215             }
 216             break;
 217         }
 218         case 24:
 219         {
 220             for ( int i = 0; i < p_surface->h; i++ )
 221             {
 222                 uint8_t *p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
 223                 uint8_t *p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 224                 for ( int j = 0; j < p_surface->w; j++ )
 225                 {
 226                     uint8_t r, g, b;
 227                     SDL_GetRGB( *(uint32_t*)p_src, p_surface->format,
 228                                 &r, &g, &b );
 229                     *(p_dst++) = r;
 230                     *(p_dst++) = g;
 231                     *(p_dst++) = b;
 232                     p_src += 3;
 233                 }
 234             }
 235             break;
 236         }
 237         case 32:
 238         {
 239             for ( int i = 0; i < p_surface->h; i++ )
 240             {
 241                 uint8_t *p_src = (uint8_t*)p_surface->pixels + i * p_surface->pitch;
 242                 uint8_t *p_dst = p_pic->p[0].p_pixels + i * p_pic->p[0].i_pitch;
 243                 for ( int j = 0; j < p_surface->w; j++ )
 244                 {
 245                     uint8_t r, g, b, a;
 246                     SDL_GetRGBA( *(uint32_t*)p_src, p_surface->format,
 247                                 &r, &g, &b, &a );
 248                     *(p_dst++) = b;
 249                     *(p_dst++) = g;
 250                     *(p_dst++) = r;
 251                     *(p_dst++) = a;
 252                     p_src += 4;
 253                 }
 254             }
 255             break;
 256         }
 257     }
 258
 259     p_pic->date = (p_block->i_pts != VLC_TICK_INVALID) ?
 260         p_block->i_pts : p_block->i_dts;
 261
 262     decoder_QueueVideo( p_dec, p_pic );
 263
 264 error:
 265     if ( p_surface != NULL ) SDL_FreeSurface( p_surface );
 266     block_Release( p_block );
 267     return VLCDEC_SUCCESS;
 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 }