modules/demux/vc1.c

   1 /*****************************************************************************
   2  * vc1.c : VC1 Video demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@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_demux.h>
  35 #include "vlc_codec.h"
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 static int  Open ( vlc_object_t * );
  41 static void Close( vlc_object_t * );
  42
  43 #define FPS_TEXT N_("Frames per Second")
  44 #define FPS_LONGTEXT N_("Desired frame rate for the VC-1 stream.")
  45
  46 vlc_module_begin();
  47     set_shortname( "VC-1");
  48     set_category( CAT_INPUT );
  49     set_subcategory( SUBCAT_INPUT_DEMUX );
  50     set_description( N_("VC1 video demuxer" ) );
  51     set_capability( "demux", 0 );
  52     add_float( "vc1-fps", 25.0, NULL, FPS_TEXT, FPS_LONGTEXT, true );
  53     set_callbacks( Open, Close );
  54     add_shortcut( "vc1" );
  55 vlc_module_end();
  56
  57 /*****************************************************************************
  58  * Local prototypes
  59  *****************************************************************************/
  60 struct demux_sys_t
  61 {
  62     mtime_t     i_dts;
  63     es_out_id_t *p_es;
  64
  65     float       f_fps;
  66     decoder_t *p_packetizer;
  67 };
  68
  69 static int Demux( demux_t * );
  70 static int Control( demux_t *, int, va_list );
  71
  72 #define VC1_PACKET_SIZE 4096
  73
  74 /*****************************************************************************
  75  * Open: initializes demux structures
  76  *****************************************************************************/
  77 static int Open( vlc_object_t * p_this )
  78 {
  79     demux_t     *p_demux = (demux_t*)p_this;
  80     demux_sys_t *p_sys;
  81     const uint8_t *p_peek;
  82     es_format_t fmt;
  83
  84     if( stream_Peek( p_demux->s, &p_peek, 5 ) < 5 ) return VLC_EGENERIC;
  85
  86     if( p_peek[0] != 0x00 || p_peek[1] != 0x00 ||
  87         p_peek[2] != 0x00 || p_peek[3] != 0x01 ||
  88         p_peek[4] != 0x0f ) /* Sequence header */
  89     {
  90         if( !p_demux->b_force )
  91         {
  92             msg_Warn( p_demux, "vc-1 module discarded (no startcode)" );
  93             return VLC_EGENERIC;
  94         }
  95
  96         msg_Err( p_demux, "this doesn't look like a VC-1 ES stream, "
  97                  "continuing anyway" );
  98     }
  99
 100     p_demux->pf_demux  = Demux;
 101     p_demux->pf_control= Control;
 102     p_demux->p_sys     = p_sys = malloc( sizeof( demux_sys_t ) );
 103     p_sys->p_es        = NULL;
 104     p_sys->i_dts       = 1;
 105     p_sys->f_fps = var_CreateGetFloat( p_demux, "vc1-fps" );
 106     if( p_sys->f_fps < 0.001 )
 107         p_sys->f_fps = 0.0;
 108
 109     /* Load the packetizer */
 110     es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'W', 'V', 'C', '1' ) );
 111     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "VC-1" );
 112     if( !p_sys->p_packetizer )
 113     {
 114         free( p_sys );
 115         return VLC_EGENERIC;
 116     }
 117     return VLC_SUCCESS;
 118 }
 119
 120 /*****************************************************************************
 121  * Close: frees unused data
 122  *****************************************************************************/
 123 static void Close( vlc_object_t * p_this )
 124 {
 125     demux_t     *p_demux = (demux_t*)p_this;
 126     demux_sys_t *p_sys = p_demux->p_sys;
 127
 128     demux_PacketizerDestroy( p_sys->p_packetizer );
 129     free( p_sys );
 130 }
 131
 132 /*****************************************************************************
 133  * Demux: reads and demuxes data packets
 134  *****************************************************************************
 135  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 136  *****************************************************************************/
 137 static int Demux( demux_t *p_demux)
 138 {
 139     demux_sys_t *p_sys = p_demux->p_sys;
 140     block_t *p_block_in, *p_block_out;
 141
 142     if( ( p_block_in = stream_Block( p_demux->s, VC1_PACKET_SIZE ) ) == NULL )
 143         return 0;
 144
 145     /*  */
 146     p_block_in->i_dts = 1;
 147     p_block_in->i_pts = 1;
 148
 149     while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in )) )
 150     {
 151         while( p_block_out )
 152         {
 153             block_t *p_next = p_block_out->p_next;
 154
 155             p_block_out->p_next = NULL;
 156
 157             if( p_sys->p_es == NULL )
 158             {
 159                 p_sys->p_packetizer->fmt_out.b_packetized = true;
 160                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 161             }
 162
 163             es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_dts );
 164             p_block_out->i_dts = p_sys->i_dts;
 165             p_block_out->i_pts = p_sys->i_dts;
 166
 167             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 168
 169             p_block_out = p_next;
 170
 171             if( p_sys->p_packetizer->fmt_out.video.i_frame_rate > 0 &&
 172                 p_sys->p_packetizer->fmt_out.video.i_frame_rate_base > 0 )
 173                 p_sys->i_dts += INT64_C(1000000) *
 174                     p_sys->p_packetizer->fmt_out.video.i_frame_rate_base /
 175                     p_sys->p_packetizer->fmt_out.video.i_frame_rate;
 176             else if( p_sys->f_fps > 0.001 )
 177                 p_sys->i_dts += (int64_t)((double)1000000.0 / p_sys->f_fps);
 178             else
 179                 p_sys->i_dts += INT64_C(1000000) / 25;
 180         }
 181     }
 182     return 1;
 183 }
 184
 185 /*****************************************************************************
 186  * Control:
 187  *****************************************************************************/
 188 static int Control( demux_t *p_demux, int i_query, va_list args )
 189 {
 190     /* demux_sys_t *p_sys  = p_demux->p_sys; */
 191     /* FIXME calculate the bitrate */
 192     if( i_query == DEMUX_SET_TIME )
 193         return VLC_EGENERIC;
 194     else
 195         return demux_vaControlHelper( p_demux->s,
 196                                        0, -1,
 197                                        0, 1, i_query, args );
 198 }
 199