image.c

video linux conference

/*****************************************************************************
 * image.c : image video output
 *****************************************************************************
 * Copyright (C) 2004 VideoLAN
 * $Id: snapshot.c 8644 2004-09-05 16:53:04Z fkuehne $
 *
 * Authors: Cl閙ent Stenac <[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 <vlc/vlc.h>
#include <vlc/vout.h>
#include <vlc/intf.h>

#include "vlc_image.h"

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Create    ( vlc_object_t * );
static void Destroy   ( vlc_object_t * );

static int  Init      ( vout_thread_t * );
static void End       ( vout_thread_t *p_vout );
static void Display   ( vout_thread_t *, picture_t * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define FORMAT_TEXT N_( "Image format" )
#define FORMAT_LONGTEXT N_( "Set the format of the output image." )

#define RATIO_TEXT N_( "Recording ratio" )
#define RATIO_LONGTEXT N_( "Set the ratio of images that are recorded. "\
                           "3 means that one image out of three is recorded." )

#define PREFIX_TEXT N_( "Filename prefix" )
#define PREFIX_LONGTEXT N_( "Set the prefix of the filename. Output filename "\
                            "will have the form prefixNUMBER.format" )

static char *psz_format_list[] = { "png" };
static char *psz_format_list_text[] = { "PNG" };

vlc_module_begin( );
    set_shortname( _( "Image file" ) );
    set_description( _( "Image video output" ) );
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_VOUT );
    set_capability( "video output", 0 );

    add_string( "image-out-format", "png", NULL,  FORMAT_TEXT, FORMAT_LONGTEXT,
                                                  VLC_FALSE );
        change_string_list( psz_format_list, psz_format_list_text, 0 );
    add_integer( "image-out-ratio", 3 , NULL,  RATIO_TEXT, RATIO_LONGTEXT,
                                                  VLC_FALSE );
    add_string( "image-out-prefix", "img", NULL, PREFIX_TEXT, PREFIX_LONGTEXT,
                                                 VLC_FALSE );
    set_callbacks( Create, Destroy );
vlc_module_end();

/*****************************************************************************
 * vout_sys_t: video output descriptor
 *****************************************************************************/
struct vout_sys_t
{
    char        *psz_prefix;    /* Prefix */
    int         i_ratio;    /* Image ratio */

    int         i_current;  /* Current image */
    int         i_frames;  /* Number of frames */

    image_handler_t *p_image;
};

#define FREE( p ) if( p ) { free( p ); p = NULL; }

/*****************************************************************************
 * Create: allocates video thread
 *****************************************************************************
 * This function allocates and initializes a vout method.
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = ( vout_thread_t * )p_this;

    /* Allocate instance and initialize some members */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( ! p_vout->p_sys )
        return VLC_ENOMEM;

    p_vout->p_sys->psz_prefix =
            var_CreateGetString( p_this, "image-out-prefix" );
    p_vout->p_sys->i_ratio =
            var_CreateGetInteger( p_this, "image-out-ratio" );
    p_vout->p_sys->i_current = 0;
    p_vout->p_sys->p_image = image_HandlerCreate( p_vout );

    if( !p_vout->p_sys->p_image )
    {
        msg_Err( p_this, "unable to create image handler") ;
        FREE( p_vout->p_sys->psz_prefix );
        FREE( p_vout->p_sys );
        return VLC_EGENERIC;
    }

    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = NULL;
    p_vout->pf_render = Display;
    p_vout->pf_display = NULL;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Init: initialize video thread
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    int i_index;
    picture_t *p_pic;

    /* Initialize the output structure */
    p_vout->output.i_chroma = p_vout->render.i_chroma;
    p_vout->output.pf_setpalette = NULL;
    p_vout->output.i_width = p_vout->render.i_width;
    p_vout->output.i_height = p_vout->render.i_height;
    p_vout->output.i_aspect = p_vout->output.i_width
                               * VOUT_ASPECT_FACTOR / p_vout->output.i_height;

    p_vout->output.i_rmask = 0xff0000;
    p_vout->output.i_gmask = 0x00ff00;
    p_vout->output.i_bmask = 0x0000ff;

    /* Try to initialize 1 direct buffer */
    p_pic = NULL;

    /* Find an empty picture slot */
    for( i_index = 0 ; i_index < VOUT_MAX_PICTURES ; i_index++ )
    {
        if( p_vout->p_picture[ i_index ].i_status == FREE_PICTURE )
        {
            p_pic = p_vout->p_picture + i_index;
            break;
        }
    }

    /* Allocate the picture */
    if( p_pic == NULL )
    {
        return VLC_EGENERIC;
    }

    vout_AllocatePicture( VLC_OBJECT(p_vout), p_pic, p_vout->output.i_chroma,
                          p_vout->output.i_width, p_vout->output.i_height,
                          p_vout->output.i_aspect );

    if( p_pic->i_planes == 0 )
    {
        return VLC_EGENERIC;
    }

    p_pic->i_status = DESTROYED_PICTURE;
    p_pic->i_type   = DIRECT_PICTURE;

    PP_OUTPUTPICTURE[ I_OUTPUTPICTURES ] = p_pic;
    I_OUTPUTPICTURES++;
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Destroy: destroy video thread
 *****************************************************************************
 * Terminate an output method created by Create
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = ( vout_thread_t * )p_this;

    /* Destroy structure */
    image_HandlerDelete( p_vout->p_sys->p_image );
    FREE( p_vout->p_sys->psz_prefix );
    FREE( p_vout->p_sys );
}

/*****************************************************************************
 * Display: displays previously rendered output
 *****************************************************************************
 * This function copies the rendered picture into our circular buffer.
 *****************************************************************************/
static void Display( vout_thread_t *p_vout, picture_t *p_pic )
{
    video_format_t fmt_in = {0}, fmt_out = {0};

    char *psz_filename;

    if( p_vout->p_sys->i_frames % p_vout->p_sys->i_ratio != 0 )
    {
        p_vout->p_sys->i_frames++;
        return;
    }
    p_vout->p_sys->i_frames++;
    psz_filename = (char *)malloc( strlen( p_vout->p_sys->psz_prefix ) +
                                         10 );

    fmt_in.i_chroma = p_vout->render.i_chroma;
    fmt_out.i_width = fmt_in.i_width = p_vout->render.i_width;
    fmt_out.i_height = fmt_in.i_height = p_vout->render.i_height;

    p_vout->p_sys->i_current++;

    sprintf( psz_filename, "%s%.6i.%s", p_vout->p_sys->psz_prefix,
                                      p_vout->p_sys->i_current,
                                      "png" );

    image_WriteUrl( p_vout->p_sys->p_image, p_pic,
                    &fmt_in, &fmt_out, psz_filename ) ;
    free( psz_filename );
    return;
}


static void End( vout_thread_t *p_vout )
{
}