video_output.c 30.9 KB
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/*****************************************************************************
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 * video_output.c : video output thread
 * This module describes the programming interface for video output threads.
 * It includes functions allowing to open a new thread, send pictures to a
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 * thread, and destroy a previously oppened video output thread.
 *****************************************************************************
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 * Copyright (C) 2000-2001 VideoLAN
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 * $Id: video_output.c,v 1.190 2002/08/12 09:34:15 sam Exp $
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 *
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 * Authors: Vincent Seguin <seguin@via.ecp.fr>
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 *
 * 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.
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 *
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 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * 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.
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 *****************************************************************************/
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/*****************************************************************************
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 * Preamble
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 *****************************************************************************/
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#include <errno.h>                                                 /* ENOMEM */
#include <stdlib.h>                                                /* free() */
#include <stdio.h>                                              /* sprintf() */
#include <string.h>                                            /* strerror() */
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#include <vlc/vlc.h>
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#ifdef HAVE_SYS_TIMES_H
#   include <sys/times.h>
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#endif
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#include "video.h"
#include "video_output.h"
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#if defined( SYS_DARWIN )
#include "darwin_specific.h"
#endif

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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static int      InitThread        ( vout_thread_t * );
static void     RunThread         ( vout_thread_t * );
static void     ErrorThread       ( vout_thread_t * );
static void     EndThread         ( vout_thread_t * );
static void     DestroyThread     ( vout_thread_t * );
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static int      ReduceHeight      ( int );
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static int      BinaryLog         ( u32 );
static void     MaskToShift       ( int *, int *, u32 );
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static void     InitWindowSize    ( vout_thread_t *, int *, int * );
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/*****************************************************************************
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 * vout_CreateThread: creates a new video output thread
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 *****************************************************************************
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 * This function creates a new video output thread, and returns a pointer
 * to its description. On error, it returns NULL.
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 *****************************************************************************/
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vout_thread_t * __vout_CreateThread ( vlc_object_t *p_parent,
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                                      int i_width, int i_height,
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                                      vlc_fourcc_t i_chroma, int i_aspect )
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{
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    vout_thread_t * p_vout;                             /* thread descriptor */
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    int             i_index;                                /* loop variable */
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    char          * psz_plugin;
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    /* Allocate descriptor */
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    p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
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    if( p_vout == NULL )
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    {
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        msg_Err( p_parent, "out of memory" );
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        return( NULL );
    }
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    /* If the parent is not a VOUT object, that means we are at the start of
     * the video output pipe */
    if( p_parent->i_object_type != VLC_OBJECT_VOUT )
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    {
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        /* look for the default filter configuration */
        p_vout->psz_filter_chain = config_GetPsz( p_parent, "filter" );
    }
    else
    {
        /* continue the parent's filter chain */
        char *psz_end;

        psz_end = strchr( ((vout_thread_t *)p_parent)->psz_filter_chain, ':' );
        if( psz_end && *(psz_end+1) )
            p_vout->psz_filter_chain = strdup( psz_end+1 );
        else p_vout->psz_filter_chain = NULL;
    }

    /* Choose the video output module */
    if( !p_vout->psz_filter_chain )
    {
        psz_plugin = config_GetPsz( p_parent, "vout" );
    }
    else
    {
        /* the filter chain is a string list of filters separated by double
         * colons */
        char *psz_end;

        psz_end = strchr( p_vout->psz_filter_chain, ':' );
        if( psz_end )
            psz_plugin = strndup( p_vout->psz_filter_chain,
                                  psz_end - p_vout->psz_filter_chain );
        else psz_plugin = strdup( p_vout->psz_filter_chain );
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    }

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    /* Initialize pictures and subpictures - translation tables and functions
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     * will be initialized later in InitThread */
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    for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++)
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    {
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        p_vout->p_picture[i_index].i_status = FREE_PICTURE;
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        p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
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    }
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    for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
    {
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        p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
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        p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
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    }
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    /* No images in the heap */
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    p_vout->i_heap_size = 0;

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    /* Initialize the rendering heap */
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    I_RENDERPICTURES = 0;
    p_vout->render.i_width    = i_width;
    p_vout->render.i_height   = i_height;
    p_vout->render.i_chroma   = i_chroma;
    p_vout->render.i_aspect   = i_aspect;
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    p_vout->render.i_rmask    = 0;
    p_vout->render.i_gmask    = 0;
    p_vout->render.i_bmask    = 0;

    /* Zero the output heap */
    I_OUTPUTPICTURES = 0;
    p_vout->output.i_width    = 0;
    p_vout->output.i_height   = 0;
    p_vout->output.i_chroma   = 0;
    p_vout->output.i_aspect   = 0;

    p_vout->output.i_rmask    = 0;
    p_vout->output.i_gmask    = 0;
    p_vout->output.i_bmask    = 0;

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    /* Initialize misc stuff */
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    p_vout->i_changes    = 0;
    p_vout->f_gamma      = 0;
    p_vout->b_grayscale  = 0;
    p_vout->b_info       = 0;
    p_vout->b_interface  = 0;
    p_vout->b_scale      = 1;
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    p_vout->b_fullscreen = 0;
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    p_vout->render_time  = 10;
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    p_vout->c_fps_samples= 0;
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    p_vout->i_mouse_x = 0;
    p_vout->i_mouse_y = 0;
    p_vout->i_mouse_button = 0;

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    /* user requested fullscreen? */
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    if( config_GetInt( p_vout, "fullscreen" ) )
    {
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        p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
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    }
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    /* Initialize the dimensions of the video window */
    InitWindowSize( p_vout, &p_vout->i_window_width,
                    &p_vout->i_window_height );


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    p_vout->p_module = module_Need( p_vout,
                           ( p_vout->psz_filter_chain ) ?
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                           "video filter" : "video output",
                           psz_plugin );
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    if( psz_plugin ) free( psz_plugin );
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    if( p_vout->p_module == NULL )
    {
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        msg_Err( p_vout, "no suitable vout module" );
        vlc_object_destroy( p_vout );
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        return( NULL );
    }

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    /* Create thread and set locks */
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    vlc_mutex_init( p_vout, &p_vout->picture_lock );
    vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
    vlc_mutex_init( p_vout, &p_vout->change_lock );
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    vlc_object_attach( p_vout, p_parent );

    if( vlc_thread_create( p_vout, "video output", RunThread, 0 ) )
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    {
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        msg_Err( p_vout, "%s", strerror(ENOMEM) );
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        module_Unneed( p_vout, p_vout->p_module );
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        vlc_object_destroy( p_vout );
        return NULL;
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    }
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    return p_vout;
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}

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/*****************************************************************************
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 * vout_DestroyThread: destroys a previously created thread
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 *****************************************************************************
 * Destroy a terminated thread.
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 * The function will request a destruction of the specified thread. If pi_error
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 * is NULL, it will return once the thread is destroyed. Else, it will be
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 * update using one of the THREAD_* constants.
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 *****************************************************************************/
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void vout_DestroyThread( vout_thread_t *p_vout )
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{
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    /* Request thread destruction */
    p_vout->b_die = 1;
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    vlc_thread_join( p_vout );
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    /* Free structure */
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    vlc_object_destroy( p_vout );
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}

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/*****************************************************************************
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 * InitThread: initialize video output thread
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 *****************************************************************************
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 * This function is called from RunThread and performs the second step of the
 * initialization. It returns 0 on success. Note that the thread's flag are not
 * modified inside this function.
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 *****************************************************************************/
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static int InitThread( vout_thread_t *p_vout )
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{
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    int i, i_pgcd;
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    vlc_mutex_lock( &p_vout->change_lock );

#ifdef STATS
    p_vout->c_loops = 0;
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#endif

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    /* Initialize output method, it allocates direct buffers for us */
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    if( p_vout->pf_init( p_vout ) )
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    {
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        vlc_mutex_unlock( &p_vout->change_lock );
        return( 1 );
    }

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    if( !I_OUTPUTPICTURES )
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    {
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        msg_Err( p_vout, "plugin was unable to allocate at least "
                         "one direct buffer" );
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        p_vout->pf_end( p_vout );
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        vlc_mutex_unlock( &p_vout->change_lock );
        return( 1 );
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    }
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    msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
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    i_pgcd = ReduceHeight( p_vout->render.i_aspect );
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    msg_Dbg( p_vout,
             "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
             p_vout->render.i_width, p_vout->render.i_height,
             p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
             p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
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    i_pgcd = ReduceHeight( p_vout->output.i_aspect );
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    msg_Dbg( p_vout,
             "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
             p_vout->output.i_width, p_vout->output.i_height,
             p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
             p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
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    /* Calculate shifts from system-updated masks */
    MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
                 p_vout->output.i_rmask );
    MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
                 p_vout->output.i_gmask );
    MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
                 p_vout->output.i_bmask );

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    /* Check whether we managed to create direct buffers similar to
     * the render buffers, ie same size, chroma and aspect ratio */
    if( ( p_vout->output.i_width == p_vout->render.i_width )
     && ( p_vout->output.i_height == p_vout->render.i_height )
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     && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) )
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     && ( p_vout->output.i_aspect == p_vout->render.i_aspect ) )
    {
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        /* Cool ! We have direct buffers, we can ask the decoder to
         * directly decode into them ! Map the first render buffers to
         * the first direct buffers, but keep the first direct buffer
         * for memcpy operations */
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        p_vout->b_direct = 1;

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        msg_Dbg( p_vout, "direct render, mapping "
                 "render pictures 0-%i to system pictures 1-%i",
                 VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
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        for( i = 1; i < VOUT_MAX_PICTURES; i++ )
        {
            PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
            I_RENDERPICTURES++;
        }
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    }
    else
    {
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        /* Rats... Something is wrong here, we could not find an output
         * plugin able to directly render what we decode. See if we can
         * find a chroma plugin to do the conversion */
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        p_vout->b_direct = 0;

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        /* Choose the best module */
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        p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL );
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        if( p_vout->chroma.p_module == NULL )
        {
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            msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
                     &p_vout->render.i_chroma, &p_vout->output.i_chroma );
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            p_vout->pf_end( p_vout );
            vlc_mutex_unlock( &p_vout->change_lock );
            return( 1 );
        }
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        if( I_OUTPUTPICTURES < 2 * VOUT_MAX_PICTURES )
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        {
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            msg_Dbg( p_vout, "indirect render, mapping "
                     "render pictures %i-%i to system pictures %i-%i",
                     I_OUTPUTPICTURES - 1, 2 * VOUT_MAX_PICTURES - 2,
                     I_OUTPUTPICTURES, 2 * VOUT_MAX_PICTURES - 1 );
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        }
        else
        {
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            /* FIXME: if this happens, we don't have any render pictures left */
            msg_Dbg( p_vout, "indirect render, no system pictures needed,"
                     " we have %i directbuffers", I_OUTPUTPICTURES );
            msg_Err( p_vout, "this is a bug!" );
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        }
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        /* Append render buffers after the direct buffers */
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        for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
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        {
            PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
            I_RENDERPICTURES++;
        }
    }
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    /* Link pictures back to their heap */
    for( i = 0 ; i < I_RENDERPICTURES ; i++ )
    {
        PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
    }

    for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
    {
        PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
    }

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/* XXX XXX mark thread ready */
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    return( 0 );
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}

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/*****************************************************************************
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 * RunThread: video output thread
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 *****************************************************************************
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 * Video output thread. This function does only returns when the thread is
 * terminated. It handles the pictures arriving in the video heap and the
 * display device events.
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 *****************************************************************************/
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static void RunThread( vout_thread_t *p_vout)
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{
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    int             i_index;                                /* index in heap */
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    int             i_idle_loops = 0;  /* loops without displaying a picture */
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    mtime_t         current_date;                            /* current date */
    mtime_t         display_date;                            /* display date */

    picture_t *     p_picture;                            /* picture pointer */
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    picture_t *     p_last_picture = NULL;                   /* last picture */
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    picture_t *     p_directbuffer;              /* direct buffer to display */

    subpicture_t *  p_subpic;                          /* subpicture pointer */

    /*
     * Initialize thread
     */
    p_vout->b_error = InitThread( p_vout );
    if( p_vout->b_error )
    {
        /* Destroy thread structures allocated by Create and InitThread */
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        DestroyThread( p_vout );
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        return;
    }
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    /*
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     * Main loop - it is not executed if an error occured during
     * initialization
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     */
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    while( (!p_vout->b_die) && (!p_vout->b_error) )
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    {
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        /* Initialize loop variables */
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        display_date = 0;
        current_date = mdate();
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#ifdef STATS
        p_vout->c_loops++;
        if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
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        {
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            msg_Dbg( p_vout, "picture heap: %d/%d",
                     I_RENDERPICTURES, p_vout->i_heap_size );
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        }
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#endif
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        /*
         * Find the picture to display - this operation does not need lock,
         * since only READY_PICTUREs are handled
         */
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        p_picture = NULL;

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        for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
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        {
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            if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
                && ( (p_picture == NULL) ||
                     (PP_RENDERPICTURE[i_index]->date < display_date) ) )
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            {
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                p_picture = PP_RENDERPICTURE[i_index];
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                display_date = p_picture->date;
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            }
        }
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        if( p_picture != NULL )
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        {
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            /* If we met the last picture, parse again to see whether there is
             * a more appropriate one. */
            if( p_picture == p_last_picture )
            {
                for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
                {
                    if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
                        && (PP_RENDERPICTURE[i_index] != p_last_picture)
                        && ((p_picture == p_last_picture) ||
                            (PP_RENDERPICTURE[i_index]->date < display_date)) )
                    {
                        p_picture = PP_RENDERPICTURE[i_index];
                        display_date = p_picture->date;
                    }
                }
            }
    
            /* If we found better than the last picture, destroy it */
            if( p_last_picture && p_picture != p_last_picture )
            {
                vlc_mutex_lock( &p_vout->picture_lock );
                if( p_last_picture->i_refcount )
                {
                    p_last_picture->i_status = DISPLAYED_PICTURE;
                }
                else
                {
                    p_last_picture->i_status = DESTROYED_PICTURE;
                    p_vout->i_heap_size--;
                }
                vlc_mutex_unlock( &p_vout->picture_lock );
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                p_last_picture = NULL;
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            }

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            /* Compute FPS rate */
            p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
                = display_date;

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            if( !p_picture->b_force &&
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                p_picture != p_last_picture &&
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                display_date < current_date + p_vout->render_time )
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            {
                /* Picture is late: it will be destroyed and the thread
                 * will directly choose the next picture */
                vlc_mutex_lock( &p_vout->picture_lock );
                if( p_picture->i_refcount )
                {
                    /* Pretend we displayed the picture, but don't destroy
                     * it since the decoder might still need it. */
                    p_picture->i_status = DISPLAYED_PICTURE;
                }
                else
                {
                    /* Destroy the picture without displaying it */
                    p_picture->i_status = DESTROYED_PICTURE;
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                    p_vout->i_heap_size--;
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                }
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                msg_Warn( p_vout, "late picture skipped (%lld)",
                                  current_date - display_date );
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                vlc_mutex_unlock( &p_vout->picture_lock );

                continue;
            }
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#if 0
            /* Removed because it causes problems for some people --Meuuh */
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            if( display_date > current_date + VOUT_BOGUS_DELAY )
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            {
                /* Picture is waaay too early: it will be destroyed */
                vlc_mutex_lock( &p_vout->picture_lock );
                if( p_picture->i_refcount )
                {
                    /* Pretend we displayed the picture, but don't destroy
                     * it since the decoder might still need it. */
                    p_picture->i_status = DISPLAYED_PICTURE;
                }
                else
                {
                    /* Destroy the picture without displaying it */
                    p_picture->i_status = DESTROYED_PICTURE;
                    p_vout->i_heap_size--;
                }
                intf_WarnMsg( 1, "vout warning: early picture skipped (%lld)",
                              display_date - current_date );
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                vlc_mutex_unlock( &p_vout->picture_lock );

                continue;
            }
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#endif
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            if( display_date > current_date + VOUT_DISPLAY_DELAY )
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            {
                /* A picture is ready to be rendered, but its rendering date
                 * is far from the current one so the thread will perform an
                 * empty loop as if no picture were found. The picture state
                 * is unchanged */
                p_picture    = NULL;
                display_date = 0;
            }
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            else if( p_picture == p_last_picture )
            {
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                /* We are asked to repeat the previous picture, but we first
                 * wait for a couple of idle loops */
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                if( i_idle_loops < 4 )
                {
                    p_picture    = NULL;
                    display_date = 0;
                }
                else
                {
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                    /*intf_WarnMsg( 6, "vout info: duplicating picture" );*/
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                }
            }
        }

        if( p_picture == NULL )
        {
            i_idle_loops++;
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        }

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        /*
         * Check for subpictures to display
         */
        p_subpic = vout_SortSubPictures( p_vout, display_date );
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        /*
         * Perform rendering
         */
        p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );

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        /*
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         * Call the plugin-specific rendering method if there is one
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         */
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        if( p_picture != NULL && p_vout->pf_render )
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        {
            /* Render the direct buffer returned by vout_RenderPicture */
            p_vout->pf_render( p_vout, p_directbuffer );
        }

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        /*
         * Sleep, wake up
         */
        if( display_date != 0 )
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        {
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            /* Store render time using Bresenham algorithm */
            p_vout->render_time += mdate() - current_date;
            p_vout->render_time >>= 1;
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        }

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        /* Give back change lock */
        vlc_mutex_unlock( &p_vout->change_lock );

        /* Sleep a while or until a given date */
        if( display_date != 0 )
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        {
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            mwait( display_date - VOUT_MWAIT_TOLERANCE );
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        }
        else
        {
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            msleep( VOUT_IDLE_SLEEP );
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        }
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        /* On awakening, take back lock and send immediately picture
         * to display. */
        vlc_mutex_lock( &p_vout->change_lock );

        /*
         * Display the previously rendered picture
         */
        if( p_picture != NULL )
        {
            /* Display the direct buffer returned by vout_RenderPicture */
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            if( p_vout->pf_display )
            {
                p_vout->pf_display( p_vout, p_directbuffer );
            }
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            /* Reinitialize idle loop count */
            i_idle_loops = 0;

            /* Tell the vout this was the last picture and that it does not
             * need to be forced anymore. */
            p_last_picture = p_picture;
            p_last_picture->b_force = 0;
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        }
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        /*
         * Check events and manage thread
         */
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        if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
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        {
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            /* A fatal error occured, and the thread must terminate
             * immediately, without displaying anything - setting b_error to 1
             * causes the immediate end of the main while() loop. */
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            p_vout->b_error = 1;
        }
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        if( p_vout->i_changes & VOUT_SIZE_CHANGE )
        {
            /* this must only happen when the vout plugin is incapable of
             * rescaling the picture itself. In this case we need to destroy
             * the current picture buffers and recreate new ones with the right
             * dimensions */
            int i;

            p_vout->i_changes &= ~VOUT_SIZE_CHANGE;

            p_vout->pf_end( p_vout );
            for( i = 0; i < I_OUTPUTPICTURES; i++ )
                 p_vout->p_picture[ i ].i_status = FREE_PICTURE;

            I_OUTPUTPICTURES = 0;
            if( p_vout->pf_init( p_vout ) )
            {
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                msg_Err( p_vout, "cannot resize display" );
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                /* FIXME: pf_end will be called again in EndThread() */
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                p_vout->b_error = 1;
            }

            /* Need to reinitialise the chroma plugin */
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            p_vout->chroma.p_module->pf_deactivate( VLC_OBJECT(p_vout) );
            p_vout->chroma.p_module->pf_activate( VLC_OBJECT(p_vout) );
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        }

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    }
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    /*
     * Error loop - wait until the thread destruction is requested
     */
    if( p_vout->b_error )
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    {
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        ErrorThread( p_vout );
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    }
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    /* End of thread */
    EndThread( p_vout );

    /* Destroy thread structures allocated by CreateThread */
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    DestroyThread( p_vout );
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}

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/*****************************************************************************
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 * ErrorThread: RunThread() error loop
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 *****************************************************************************
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 * This function is called when an error occured during thread main's loop. The
 * thread can still receive feed, but must be ready to terminate as soon as
 * possible.
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 *****************************************************************************/
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static void ErrorThread( vout_thread_t *p_vout )
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{
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    /* Wait until a `die' order */
    while( !p_vout->b_die )
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    {
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        /* Sleep a while */
        msleep( VOUT_IDLE_SLEEP );
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    }
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}

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/*****************************************************************************
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 * EndThread: thread destruction
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 *****************************************************************************
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 * This function is called when the thread ends after a sucessful
 * initialization. It frees all ressources allocated by InitThread.
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 *****************************************************************************/
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static void EndThread( vout_thread_t *p_vout )
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{
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    int     i_index;                                        /* index in heap */
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#ifdef STATS
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    {
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        struct tms cpu_usage;
        times( &cpu_usage );
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        msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
                 cpu_usage.tms_utime, cpu_usage.tms_stime );
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    }
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#endif
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    if( !p_vout->b_direct )
    {
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        module_Unneed( p_vout, p_vout->chroma.p_module );
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    }

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    /* Destroy all remaining pictures */
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    for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
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    {
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        if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
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        {
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            free( p_vout->p_picture[i_index].p_data_orig );
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        }
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    }
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    /* Destroy all remaining subpictures */
    for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
    {
        if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
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        {
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            free( p_vout->p_subpicture[i_index].p_sys );
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        }
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    }
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    /* Destroy translation tables */
    p_vout->pf_end( p_vout );

    /* Release the change lock */
    vlc_mutex_unlock( &p_vout->change_lock );
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}

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/*****************************************************************************
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 * DestroyThread: thread destruction
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 *****************************************************************************
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 * This function is called when the thread ends. It frees all ressources
 * allocated by CreateThread. Status is available at this stage.
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 *****************************************************************************/
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static void DestroyThread( vout_thread_t *p_vout )
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{
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    /* Destroy the locks */
    vlc_mutex_destroy( &p_vout->picture_lock );
    vlc_mutex_destroy( &p_vout->subpicture_lock );
    vlc_mutex_destroy( &p_vout->change_lock );
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    /* Release the module */
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    module_Unneed( p_vout, p_vout->p_module );
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}

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/* following functions are local */

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static int ReduceHeight( int i_ratio )
{
    int i_dummy = VOUT_ASPECT_FACTOR;
    int i_pgcd  = 1;
 
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    if( !i_ratio )
    {
        return i_pgcd;
    }

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    /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
    while( !(i_ratio & 1) && !(i_dummy & 1) )
    {
        i_ratio >>= 1;
        i_dummy >>= 1;
        i_pgcd  <<= 1;
    }

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    while( !(i_ratio % 3) && !(i_dummy % 3) )
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    {
        i_ratio /= 3;
        i_dummy /= 3;
        i_pgcd  *= 3;
    }

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    while( !(i_ratio % 5) && !(i_dummy % 5) )
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    {
        i_ratio /= 5;
        i_dummy /= 5;
        i_pgcd  *= 5;
    }

    return i_pgcd;
}

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/*****************************************************************************
 * BinaryLog: computes the base 2 log of a binary value
 *****************************************************************************
 * This functions is used by MaskToShift, to get a bit index from a binary
 * value.
 *****************************************************************************/
static int BinaryLog(u32 i)
{
    int i_log = 0;

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    if( i == 0 ) return -31337;
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    if( i & 0xffff0000 ) i_log += 16;
    if( i & 0xff00ff00 ) i_log += 8;
    if( i & 0xf0f0f0f0 ) i_log += 4;
    if( i & 0xcccccccc ) i_log += 2;
    if( i & 0xaaaaaaaa ) i_log += 1;
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    return( i_log );
}

/*****************************************************************************
 * MaskToShift: transform a color mask into right and left shifts
 *****************************************************************************
 * This function is used for obtaining color shifts from masks.
 *****************************************************************************/
static void MaskToShift( int *pi_left, int *pi_right, u32 i_mask )
{
    u32 i_low, i_high;                 /* lower hand higher bits of the mask */

    if( !i_mask )
    {
        *pi_left = *pi_right = 0;
        return;
    }

    /* Get bits */
    i_low =  i_mask & (- i_mask);                   /* lower bit of the mask */
    i_high = i_mask + i_low;                       /* higher bit of the mask */

    /* Transform bits into an index */
    i_low =  BinaryLog (i_low);
    i_high = BinaryLog (i_high);

    /* Update pointers and return */
    *pi_left =   i_low;
    *pi_right = (8 - i_high + i_low);
}

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/*****************************************************************************
 * InitWindowSize: find the initial dimensions the video window should have.
 *****************************************************************************
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 * This function will check the "width", "height" and "zoom" config options and
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 * will calculate the size that the video window should have.
 *****************************************************************************/
static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
                            int *pi_height )
{
    int i_width, i_height;
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    double f_zoom;
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    i_width = config_GetInt( p_vout, "width" );
    i_height = config_GetInt( p_vout, "height" );
    f_zoom = config_GetFloat( p_vout, "zoom" );
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    if( (i_width >= 0) && (i_height >= 0))
    {
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        *pi_width = i_width * f_zoom;
        *pi_height = i_height * f_zoom;
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        return;
    }
    else if( i_width >= 0 )
    {
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        *pi_width = i_width * f_zoom;
        *pi_height = i_width * f_zoom * VOUT_ASPECT_FACTOR /
                        p_vout->render.i_aspect;
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        return;
    }
    else if( i_height >= 0 )
    {
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        *pi_height = i_height * f_zoom;
        *pi_width = i_height * f_zoom * p_vout->render.i_aspect /
                       VOUT_ASPECT_FACTOR;
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        return;
    }

    if( p_vout->render.i_height * p_vout->render.i_aspect
        >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
    {
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        *pi_width = p_vout->render.i_height * f_zoom
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          * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
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        *pi_height = p_vout->render.i_height * f_zoom;
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    }
    else
    {
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        *pi_width = p_vout->render.i_width * f_zoom;
        *pi_height = p_vout->render.i_width * f_zoom
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          * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect;
    }
}