fake.c

video linux conference

/*****************************************************************************
 * fake.c : Fake video input for VLC
 *****************************************************************************
 * Copyright (C) 2005 VideoLAN
 * $Id: fake.c 11376 2005-06-10 11:01:40Z fkuehne $
 *
 * Author: Christophe Massiot <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <vlc/vlc.h>
#include <vlc/input.h>

/*****************************************************************************
 * Module descriptior
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
    "Allows you to modify the default caching value for fake streams. This " \
    "value should be set in millisecond units." )
#define FPS_TEXT N_("Framerate")
#define FPS_LONGTEXT N_( \
    "Specify the number of frames per second (eg. 24, 25, 29.97, 30).")

vlc_module_begin();
    set_shortname( _("Fake") );
    set_description( _("Fake input") );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_ACCESS );

    add_integer( "fake-caching", DEFAULT_PTS_DELAY / 1000, NULL,
                 CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
    add_float( "fake-fps", 25.0, NULL, FPS_TEXT, FPS_LONGTEXT, VLC_TRUE );

    add_shortcut( "fake" );
    set_capability( "access_demux", 0 );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Access: local prototypes
 *****************************************************************************/
static int Demux  ( demux_t * );
static int Control( demux_t *, int, va_list );

struct demux_sys_t
{
    float f_fps;
    mtime_t i_last_pts;    /* only used when f_fps > 0 */

    es_out_id_t  *p_es_video;
};

/*****************************************************************************
 * Open: opens fake device
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys;
    vlc_value_t val;
    es_format_t fmt;

    /* Only when selected */
    if( *p_demux->psz_access == '\0' )
        return VLC_EGENERIC;

    /* Set up p_demux */
    p_demux->pf_demux = Demux;
    p_demux->pf_control = Control;
    p_demux->info.i_update = 0;
    p_demux->info.i_title = 0;
    p_demux->info.i_seekpoint = 0;
    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
    memset( p_sys, 0, sizeof( demux_sys_t ) );

    var_Create( p_demux, "fake-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
    var_Get( p_demux, "fake-fps", &val );
    p_sys->f_fps = val.f_float;
    p_sys->i_last_pts = 0;

    /* Declare elementary stream */
    es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC('f', 'a', 'k', 'e') );
    p_sys->p_es_video = es_out_Add( p_demux->out, &fmt );

    /* Update default_pts to a suitable value for access */
    var_Create( p_demux, "fake-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: close device, free resources
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t *)p_this;
    demux_sys_t *p_sys   = p_demux->p_sys;

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    vlc_bool_t *pb;
    int64_t    *pi64;

    switch( i_query )
    {
        /* Special for access_demux */
        case DEMUX_CAN_PAUSE:
        case DEMUX_SET_PAUSE_STATE:
        case DEMUX_CAN_CONTROL_PACE:
            pb = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
            *pb = VLC_FALSE;
            return VLC_SUCCESS;

        case DEMUX_GET_PTS_DELAY:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = (int64_t)var_GetInteger( p_demux, "fake-caching" ) * 1000;
            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = p_sys->i_last_pts;
            return VLC_SUCCESS;

        /* TODO implement others */
        default:
            return VLC_EGENERIC;
    }

    return VLC_EGENERIC;
}

/*****************************************************************************
 * Demux:
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    block_t *p_block = block_New( p_demux, 1 );

    if ( !p_sys->i_last_pts )
    {
        p_sys->i_last_pts = mdate();
    }
    else
    {
        p_sys->i_last_pts += I64C(1000000) / p_sys->f_fps;
        mwait( p_sys->i_last_pts );
    }

    p_block->i_flags |= BLOCK_FLAG_TYPE_I;
    p_block->i_dts = p_block->i_pts = p_sys->i_last_pts;

    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
    es_out_Send( p_demux->out, p_sys->p_es_video, p_block );

    return 1;
}