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vlc/modules/video_output/snapshot.c
Rémi Denis-Courmont fe087a3828 Make Zorglub less unhappy
2005-07-09 06:17:09 +00:00

398 lines
13 KiB
C
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/*****************************************************************************
* snapshot.c : snapshot plugin for vlc
*****************************************************************************
* Copyright (C) 2002 the VideoLAN team
* $Id$
*
* Authors: Olivier Aubert <oaubert@lisi.univ-lyon1.fr>
*
* 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.
*****************************************************************************/
/*****************************************************************************
* This module is a pseudo video output the offers the possibility to
* keep a cache of low-res snapshots.
* The snapshot structure is defined in include/snapshot.h
* In order to access the current snapshot cache, object variables are used:
* snapshot-list-pointer : the pointer on the first element in the list
* snapshot-datasize : size of a snapshot
* (also available in snapshot_t->i_datasize)
* snapshot-cache-size : size of the cache list
*
* It is used for the moment by the CORBA module and a specialized
* python-vlc binding.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h>
#include <vlc/vlc.h>
#include <vlc/vout.h>
#include <vlc/intf.h>
#include <snapshot.h>
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void Destroy ( vlc_object_t * );
static int Init ( vout_thread_t * );
static void Display ( vout_thread_t *, picture_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define WIDTH_TEXT N_( "snapshot width" )
#define WIDTH_LONGTEXT N_( "Set the width of the snapshot image." )
#define HEIGHT_TEXT N_( "snapshot height" )
#define HEIGHT_LONGTEXT N_( "Set the height of the snapshot image." )
#define CHROMA_TEXT N_( "chroma" )
#define CHROMA_LONGTEXT N_( "Set the desired chroma for the snapshot image (a 4 character string)." )
#define CACHE_TEXT N_( "cache size (number of images)" )
#define CACHE_LONGTEXT N_( "Set the cache size (number of images to keep)." )
vlc_module_begin( );
set_description( _( "snapshot module" ) );
set_shortname( N_("Snapshot") );
set_category( CAT_VIDEO );
set_subcategory( SUBCAT_VIDEO_VOUT );
set_capability( "video output", 1 );
add_integer( "snapshot-width", 320, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, VLC_FALSE );
add_integer( "snapshot-height", 200, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT, VLC_FALSE );
add_string( "snapshot-chroma", "RV32", NULL, CHROMA_TEXT, CHROMA_LONGTEXT, VLC_TRUE );
add_integer( "snapshot-cache-size", 50, NULL, CACHE_TEXT, CACHE_LONGTEXT, VLC_TRUE );
set_callbacks( Create, Destroy );
vlc_module_end();
/*****************************************************************************
* vout_sys_t: video output descriptor
*****************************************************************************/
struct vout_sys_t
{
snapshot_t **p_list; /* List of available snapshots */
int i_index; /* Index of the next available list member */
int i_size; /* Size of the cache */
int i_datasize; /* Size of an image */
input_thread_t *p_input; /* The input thread */
};
/*****************************************************************************
* 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;
var_Create( p_vout, "snapshot-width", VLC_VAR_INTEGER );
var_Create( p_vout, "snapshot-height", VLC_VAR_INTEGER );
var_Create( p_vout, "snapshot-datasize", VLC_VAR_INTEGER );
var_Create( p_vout, "snapshot-cache-size", VLC_VAR_INTEGER );
var_Create( p_vout, "snapshot-list-pointer", VLC_VAR_ADDRESS );
p_vout->pf_init = Init;
p_vout->pf_end = NULL;
p_vout->pf_manage = NULL;
p_vout->pf_render = NULL;
p_vout->pf_display = Display;
return VLC_SUCCESS;
}
/*****************************************************************************
* Init: initialize video thread
*****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
int i_index;
picture_t *p_pic;
vlc_value_t val;
char* psz_chroma;
int i_chroma;
int i_width;
int i_height;
int i_datasize;
i_width = config_GetInt( p_vout, "snapshot-width" );
i_height = config_GetInt( p_vout, "snapshot-height" );
psz_chroma = config_GetPsz( p_vout, "snapshot-chroma" );
if( psz_chroma )
{
if( strlen( psz_chroma ) < 4 )
{
msg_Err( p_vout, "snapshot-chroma should be 4 characters long." );
return VLC_EGENERIC;
}
i_chroma = VLC_FOURCC( psz_chroma[0], psz_chroma[1],
psz_chroma[2], psz_chroma[3] );
free( psz_chroma );
}
else
{
msg_Err( p_vout, "Cannot find chroma information." );
return VLC_EGENERIC;
}
I_OUTPUTPICTURES = 0;
/* Initialize the output structure */
p_vout->output.i_chroma = i_chroma;
p_vout->output.pf_setpalette = NULL;
p_vout->output.i_width = i_width;
p_vout->output.i_height = i_height;
p_vout->output.i_aspect = p_vout->output.i_width
* VOUT_ASPECT_FACTOR / p_vout->output.i_height;
/* Define the bitmasks */
switch( i_chroma )
{
case VLC_FOURCC( 'R','V','1','5' ):
p_vout->output.i_rmask = 0x001f;
p_vout->output.i_gmask = 0x03e0;
p_vout->output.i_bmask = 0x7c00;
break;
case VLC_FOURCC( 'R','V','1','6' ):
p_vout->output.i_rmask = 0x001f;
p_vout->output.i_gmask = 0x07e0;
p_vout->output.i_bmask = 0xf800;
break;
case VLC_FOURCC( 'R','V','2','4' ):
p_vout->output.i_rmask = 0xff0000;
p_vout->output.i_gmask = 0x00ff00;
p_vout->output.i_bmask = 0x0000ff;
break;
case VLC_FOURCC( 'R','V','3','2' ):
p_vout->output.i_rmask = 0xff0000;
p_vout->output.i_gmask = 0x00ff00;
p_vout->output.i_bmask = 0x0000ff;
break;
}
/* 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_SUCCESS;
}
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++;
/* Get datasize and set variables */
i_datasize = i_width * i_height * p_pic->p->i_pixel_pitch;
p_vout->p_sys->i_datasize = i_datasize;
p_vout->p_sys->i_index = 0;
p_vout->p_sys->i_size = config_GetInt( p_vout, "snapshot-cache-size" );
if( p_vout->p_sys->i_size < 2 )
{
msg_Err( p_vout, "snapshot-cache-size must be at least 1." );
return VLC_EGENERIC;
}
p_vout->p_sys->p_list = malloc( p_vout->p_sys->i_size * sizeof( snapshot_t * ) );
if( p_vout->p_sys->p_list == NULL )
return VLC_ENOMEM;
/* Initialize the structures for the circular buffer */
for( i_index = 0; i_index < p_vout->p_sys->i_size; i_index++ )
{
snapshot_t *p_snapshot = malloc( sizeof( snapshot_t ) );
if( p_snapshot == NULL )
return VLC_ENOMEM;
p_snapshot->i_width = i_width;
p_snapshot->i_height = i_height;
p_snapshot->i_datasize = i_datasize;
p_snapshot->date = 0;
p_snapshot->p_data = ( char* ) malloc( i_datasize );
if( p_snapshot->p_data == NULL )
return VLC_ENOMEM;
p_vout->p_sys->p_list[i_index] = p_snapshot;
}
val.i_int = i_width;
var_Set( p_vout, "snapshot-width", val );
val.i_int = i_height;
var_Set( p_vout, "snapshot-height", val );
val.i_int = i_datasize;
var_Set( p_vout, "snapshot-datasize", val );
val.i_int = p_vout->p_sys->i_size;
var_Set( p_vout, "snapshot-cache-size", val );
val.p_address = p_vout->p_sys->p_list;
var_Set( p_vout, "snapshot-list-pointer", val );
/* Get the p_input pointer (to access video times) */
p_vout->p_sys->p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT,
FIND_PARENT );
if( !p_vout->p_sys->p_input )
return VLC_ENOOBJ;
if( var_Create( p_vout->p_sys->p_input, "snapshot-id", VLC_VAR_INTEGER ) )
{
msg_Err( p_vout, "Cannot create snapshot-id variable in p_input (%d).",
p_vout->p_sys->p_input->i_object_id );
return VLC_EGENERIC;
}
/* Register the snapshot vout module at the input level */
val.i_int = p_vout->i_object_id;
if( var_Set( p_vout->p_sys->p_input, "snapshot-id", val ) )
{
msg_Err( p_vout, "Cannot register snapshot-id in p_input (%d).",
p_vout->p_sys->p_input->i_object_id );
return VLC_EGENERIC;
}
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;
vlc_object_t *p_vlc;
int i_index;
vlc_object_release( p_vout->p_sys->p_input );
var_Destroy( p_this, "snapshot-width" );
var_Destroy( p_this, "snapshot-height" );
var_Destroy( p_this, "snapshot-datasize" );
p_vlc = vlc_object_find( p_this, VLC_OBJECT_ROOT, FIND_PARENT );
if( p_vlc )
{
/* UnRegister the snapshot vout module at the root level */
/* var_Destroy (p_vlc, "snapshot-id"); */
var_Destroy( p_this->p_libvlc, "snapshot-id" );
vlc_object_release( p_vlc );
}
for( i_index = 0 ; i_index < p_vout->p_sys->i_size ; i_index++ )
{
free( p_vout->p_sys->p_list[ i_index ]->p_data );
}
free( p_vout->p_sys->p_list );
/* Destroy structure */
free( p_vout->p_sys );
}
/* Return the position in ms from the start of the movie */
static mtime_t snapshot_GetMovietime( vout_thread_t *p_vout )
{
input_thread_t* p_input;
vlc_value_t val;
mtime_t i_result;
p_input = p_vout->p_sys->p_input;
if( !p_input )
return 0;
var_Get( p_input, "time", &val );
i_result = val.i_time - p_input->i_pts_delay;
return( i_result / 1000 );
}
/*****************************************************************************
* 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 )
{
int i_index;
mtime_t i_date;
i_index = p_vout->p_sys->i_index;
p_vout->p_vlc->pf_memcpy( p_vout->p_sys->p_list[i_index]->p_data,
p_pic->p->p_pixels,
p_vout->p_sys->i_datasize );
i_date = snapshot_GetMovietime( p_vout );
p_vout->p_sys->p_list[i_index]->date = i_date;
i_index++;
if( i_index >= p_vout->p_sys->i_size )
{
i_index = 0;
}
p_vout->p_sys->i_index = i_index;
}
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