modules/demux/vc1.c

   1 /*****************************************************************************
   2  * vc1.c : VC1 Video demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 VLC authors and VideoLAN
   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 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_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, 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( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
  85
  86     if( p_peek[0] != 0x00 || p_peek[1] != 0x00 ||
  87         p_peek[2] != 0x01 || p_peek[3] != 0x0f ) /* Sequence header */
  88     {
  89         if( !p_demux->obj.force )
  90         {
  91             msg_Warn( p_demux, "vc-1 module discarded (no startcode)" );
  92             return VLC_EGENERIC;
  93         }
  94
  95         msg_Err( p_demux, "this doesn't look like a VC-1 ES stream, "
  96                  "continuing anyway" );
  97     }
  98
  99     p_sys = malloc( sizeof( demux_sys_t ) );
 100     if( unlikely(p_sys == NULL) )
 101         return VLC_ENOMEM;
 102
 103     p_demux->pf_demux  = Demux;
 104     p_demux->pf_control= Control;
 105     p_demux->p_sys     = p_sys;
 106     p_sys->p_es        = NULL;
 107     p_sys->i_dts       = 0;
 108     p_sys->f_fps = var_CreateGetFloat( p_demux, "vc1-fps" );
 109     if( p_sys->f_fps < 0.001f )
 110         p_sys->f_fps = 0.0f;
 111
 112     /* Load the packetizer */
 113     es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_VC1 );
 114     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "VC-1" );
 115     if( !p_sys->p_packetizer )
 116     {
 117         free( p_sys );
 118         return VLC_EGENERIC;
 119     }
 120     return VLC_SUCCESS;
 121 }
 122
 123 /*****************************************************************************
 124  * Close: frees unused data
 125  *****************************************************************************/
 126 static void Close( vlc_object_t * p_this )
 127 {
 128     demux_t     *p_demux = (demux_t*)p_this;
 129     demux_sys_t *p_sys = p_demux->p_sys;
 130
 131     demux_PacketizerDestroy( p_sys->p_packetizer );
 132     free( p_sys );
 133 }
 134
 135 /*****************************************************************************
 136  * Demux: reads and demuxes data packets
 137  *****************************************************************************
 138  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 139  *****************************************************************************/
 140 static int Demux( demux_t *p_demux)
 141 {
 142     demux_sys_t *p_sys = p_demux->p_sys;
 143     block_t *p_block_in, *p_block_out;
 144     bool b_eof = false;
 145
 146     p_block_in = vlc_stream_Block( p_demux->s, VC1_PACKET_SIZE );
 147     if( p_block_in == NULL )
 148     {
 149         b_eof = true;
 150     }
 151     else
 152     {
 153         /*  */
 154         p_block_in->i_dts = VLC_TS_0;
 155         p_block_in->i_pts = VLC_TS_0;
 156     }
 157
 158     while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer,
 159                                                              p_block_in ? &p_block_in : NULL )) )
 160     {
 161         while( p_block_out )
 162         {
 163             block_t *p_next = p_block_out->p_next;
 164
 165             p_block_out->p_next = NULL;
 166
 167             if( p_sys->p_es == NULL )
 168             {
 169                 p_sys->p_packetizer->fmt_out.b_packetized = true;
 170                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 171             }
 172
 173             es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_dts );
 174             p_block_out->i_dts = VLC_TS_0 + p_sys->i_dts;
 175             p_block_out->i_pts = VLC_TS_0 + p_sys->i_dts;
 176
 177             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 178
 179             p_block_out = p_next;
 180
 181             if( p_sys->p_packetizer->fmt_out.video.i_frame_rate > 0 &&
 182                 p_sys->p_packetizer->fmt_out.video.i_frame_rate_base > 0 )
 183                 p_sys->i_dts += CLOCK_FREQ *
 184                     p_sys->p_packetizer->fmt_out.video.i_frame_rate_base /
 185                     p_sys->p_packetizer->fmt_out.video.i_frame_rate;
 186             else if( p_sys->f_fps > 0.001f )
 187                 p_sys->i_dts += (int64_t)((float) CLOCK_FREQ / p_sys->f_fps);
 188             else
 189                 p_sys->i_dts += CLOCK_FREQ / 25;
 190         }
 191     }
 192
 193     return b_eof ? VLC_DEMUXER_EOF : VLC_DEMUXER_SUCCESS;
 194 }
 195
 196 /*****************************************************************************
 197  * Control:
 198  *****************************************************************************/
 199 static int Control( demux_t *p_demux, int i_query, va_list args )
 200 {
 201     /* demux_sys_t *p_sys  = p_demux->p_sys; */
 202     /* FIXME calculate the bitrate */
 203     if( i_query == DEMUX_SET_TIME )
 204         return VLC_EGENERIC;
 205     else
 206         return demux_vaControlHelper( p_demux->s,
 207                                        0, -1,
 208                                        0, 1, i_query, args );
 209 }
 210