modules/demux/vc1.c

   1 /*****************************************************************************
   2  * vc1.c : VC1 Video demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 VLC authors and VideoLAN
   5  *
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_demux.h>
  34 #include <vlc_codec.h>
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open ( vlc_object_t * );
  40 static void Close( vlc_object_t * );
  41
  42 #define FPS_TEXT N_("Frames per Second")
  43 #define FPS_LONGTEXT N_("Desired frame rate for the VC-1 stream.")
  44
  45 vlc_module_begin ()
  46     set_shortname( "VC-1")
  47     set_category( CAT_INPUT )
  48     set_subcategory( SUBCAT_INPUT_DEMUX )
  49     set_description( N_("VC1 video demuxer" ) )
  50     set_capability( "demux", 0 )
  51     add_float( "vc1-fps", 25.0, FPS_TEXT, FPS_LONGTEXT, true )
  52     set_callbacks( Open, Close )
  53     add_shortcut( "vc1" )
  54 vlc_module_end ()
  55
  56 /*****************************************************************************
  57  * Local prototypes
  58  *****************************************************************************/
  59 typedef struct
  60 {
  61     vlc_tick_t  i_dts;
  62     es_out_id_t *p_es;
  63
  64     float       f_fps;
  65     decoder_t *p_packetizer;
  66 } demux_sys_t;
  67
  68 static int Demux( demux_t * );
  69 static int Control( demux_t *, int, va_list );
  70
  71 #define VC1_PACKET_SIZE 4096
  72
  73 /*****************************************************************************
  74  * Open: initializes demux structures
  75  *****************************************************************************/
  76 static int Open( vlc_object_t * p_this )
  77 {
  78     demux_t     *p_demux = (demux_t*)p_this;
  79     demux_sys_t *p_sys;
  80     const uint8_t *p_peek;
  81     es_format_t fmt;
  82
  83     if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
  84
  85     if( p_peek[0] != 0x00 || p_peek[1] != 0x00 ||
  86         p_peek[2] != 0x01 || p_peek[3] != 0x0f ) /* Sequence header */
  87     {
  88         if( !p_demux->obj.force )
  89         {
  90             msg_Warn( p_demux, "vc-1 module discarded (no startcode)" );
  91             return VLC_EGENERIC;
  92         }
  93
  94         msg_Err( p_demux, "this doesn't look like a VC-1 ES stream, "
  95                  "continuing anyway" );
  96     }
  97
  98     p_sys = malloc( sizeof( demux_sys_t ) );
  99     if( unlikely(p_sys == NULL) )
 100         return VLC_ENOMEM;
 101
 102     p_demux->pf_demux  = Demux;
 103     p_demux->pf_control= Control;
 104     p_demux->p_sys     = p_sys;
 105     p_sys->p_es        = NULL;
 106     p_sys->i_dts       = 0;
 107     p_sys->f_fps = var_CreateGetFloat( p_demux, "vc1-fps" );
 108     if( p_sys->f_fps < 0.001f )
 109         p_sys->f_fps = 0.0f;
 110
 111     /* Load the packetizer */
 112     es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_VC1 );
 113     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "VC-1" );
 114     if( !p_sys->p_packetizer )
 115     {
 116         free( p_sys );
 117         return VLC_EGENERIC;
 118     }
 119     return VLC_SUCCESS;
 120 }
 121
 122 /*****************************************************************************
 123  * Close: frees unused data
 124  *****************************************************************************/
 125 static void Close( vlc_object_t * p_this )
 126 {
 127     demux_t     *p_demux = (demux_t*)p_this;
 128     demux_sys_t *p_sys = p_demux->p_sys;
 129
 130     demux_PacketizerDestroy( p_sys->p_packetizer );
 131     free( p_sys );
 132 }
 133
 134 /*****************************************************************************
 135  * Demux: reads and demuxes data packets
 136  *****************************************************************************
 137  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 138  *****************************************************************************/
 139 static int Demux( demux_t *p_demux)
 140 {
 141     demux_sys_t *p_sys = p_demux->p_sys;
 142     block_t *p_block_in, *p_block_out;
 143     bool b_eof = false;
 144
 145     p_block_in = vlc_stream_Block( p_demux->s, VC1_PACKET_SIZE );
 146     if( p_block_in == NULL )
 147     {
 148         b_eof = true;
 149     }
 150     else
 151     {
 152         /*  */
 153         p_block_in->i_dts = p_sys->i_dts != VLC_TICK_INVALID ? p_sys->i_dts : VLC_TICK_0;
 154         p_block_in->i_pts = p_block_in->i_dts;
 155     }
 156
 157     while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer,
 158                                                              p_block_in ? &p_block_in : NULL )) )
 159     {
 160         while( p_block_out )
 161         {
 162             block_t *p_next = p_block_out->p_next;
 163
 164             p_block_out->p_next = NULL;
 165
 166             if( p_sys->p_es == NULL )
 167             {
 168                 p_sys->p_packetizer->fmt_out.b_packetized = true;
 169                 p_sys->p_packetizer->fmt_out.i_id = 0;
 170                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 171             }
 172
 173             es_out_SetPCR( p_demux->out, VLC_TICK_0 + p_sys->i_dts );
 174             p_block_out->i_dts = VLC_TICK_0 + p_sys->i_dts;
 175             p_block_out->i_pts = VLC_TICK_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 += vlc_tick_from_samples(
 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 += (vlc_tick_t)((float) CLOCK_FREQ / p_sys->f_fps);
 188             else
 189                 p_sys->i_dts += VLC_TICK_FROM_MS(40);
 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