modules/misc/dummy/decoder.c

   1 /*****************************************************************************
   2  * decoder.c: dummy decoder plugin for vlc.
   3  *****************************************************************************
   4  * Copyright (C) 2002 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   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 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_codec.h>
  33 #include <vlc_fs.h>
  34
  35 #include <sys/types.h>
  36 #ifdef HAVE_UNISTD_H
  37 #   include <unistd.h> /* write(), close() */
  38 #elif defined( WIN32 ) && !defined( UNDER_CE )
  39 #   include <io.h>
  40 #endif
  41 #ifdef HAVE_FCNTL_H
  42 #   include <fcntl.h>
  43 #endif
  44
  45 #include <limits.h> /* PATH_MAX */
  46
  47
  48 #include "dummy.h"
  49
  50 /*****************************************************************************
  51  * decoder_sys_t : theora decoder descriptor
  52  *****************************************************************************/
  53 struct decoder_sys_t
  54 {
  55     int i_fd;
  56 };
  57
  58 /*****************************************************************************
  59  * Local prototypes
  60  *****************************************************************************/
  61 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block );
  62
  63 /*****************************************************************************
  64  * OpenDecoder: Open the decoder
  65  *****************************************************************************/
  66 static int OpenDecoderCommon( vlc_object_t *p_this, bool b_force_dump )
  67 {
  68     decoder_t *p_dec = (decoder_t*)p_this;
  69     decoder_sys_t *p_sys;
  70     char psz_file[ PATH_MAX ];
  71
  72     /* Allocate the memory needed to store the decoder's structure */
  73     if( ( p_dec->p_sys = p_sys =
  74           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
  75     {
  76         return VLC_ENOMEM;
  77     }
  78
  79     snprintf( psz_file, sizeof( psz_file), "stream.%p", p_dec );
  80
  81 #ifndef UNDER_CE
  82     if( !b_force_dump )
  83     {
  84         b_force_dump = var_CreateGetBool( p_dec, "dummy-save-es" );
  85     }
  86     if( b_force_dump )
  87     {
  88         p_sys->i_fd = vlc_open( psz_file, O_WRONLY | O_CREAT | O_TRUNC, 00644 );
  89
  90         if( p_sys->i_fd == -1 )
  91         {
  92             msg_Err( p_dec, "cannot create `%s'", psz_file );
  93             free( p_sys );
  94             return VLC_EGENERIC;
  95         }
  96
  97         msg_Dbg( p_dec, "dumping stream to file `%s'", psz_file );
  98     }
  99     else
 100 #endif
 101     {
 102         p_sys->i_fd = -1;
 103     }
 104
 105     /* Set callbacks */
 106     p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))
 107         DecodeBlock;
 108     p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
 109         DecodeBlock;
 110     p_dec->pf_decode_sub = (subpicture_t *(*)(decoder_t *, block_t **))
 111         DecodeBlock;
 112
 113     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 114
 115     return VLC_SUCCESS;
 116 }
 117
 118 int OpenDecoder( vlc_object_t *p_this )
 119 {
 120     return OpenDecoderCommon( p_this, false );
 121 }
 122 int  OpenDecoderDump( vlc_object_t *p_this )
 123 {
 124     return OpenDecoderCommon( p_this, true );
 125 }
 126
 127 /****************************************************************************
 128  * RunDecoder: the whole thing
 129  ****************************************************************************
 130  * This function must be fed with ogg packets.
 131  ****************************************************************************/
 132 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 133 {
 134     decoder_sys_t *p_sys = p_dec->p_sys;
 135     block_t *p_block;
 136
 137     if( !pp_block || !*pp_block ) return NULL;
 138     p_block = *pp_block;
 139
 140     if( p_sys->i_fd >= 0 &&
 141         p_block->i_buffer > 0 &&
 142         (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) ) == 0 )
 143     {
 144 #ifndef UNDER_CE
 145         write( p_sys->i_fd, p_block->p_buffer, p_block->i_buffer );
 146 #endif
 147
 148         msg_Dbg( p_dec, "dumped %zu bytes", p_block->i_buffer );
 149     }
 150
 151     block_Release( p_block );
 152     return NULL;
 153 }
 154
 155 /*****************************************************************************
 156  * CloseDecoder: decoder destruction
 157  *****************************************************************************/
 158 void CloseDecoder ( vlc_object_t *p_this )
 159 {
 160     decoder_t *p_dec = (decoder_t *)p_this;
 161     decoder_sys_t *p_sys = p_dec->p_sys;
 162
 163 #ifndef UNDER_CE
 164     if( p_sys->i_fd >= 0 )
 165         close( p_sys->i_fd );
 166 #endif
 167
 168     free( p_sys );
 169 }
 170