video_output.c 67.1 KB
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/*****************************************************************************
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 * video_output.c : video output thread
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 *
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 * 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) 2000-2007 the VideoLAN team
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 * $Id$
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 *
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 * Authors: Vincent Seguin <seguin@via.ecp.fr>
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 *          Gildas Bazin <gbazin@videolan.org>
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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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/
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/*****************************************************************************
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 * Preamble
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 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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#include <vlc_common.h>
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#include <stdlib.h>                                                /* free() */
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#include <string.h>
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#ifdef HAVE_SYS_TIMES_H
#   include <sys/times.h>
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#endif
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#include <vlc_vout.h>
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#include <vlc_filter.h>
#include <vlc_osd.h>
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#include <assert.h>
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#if defined( __APPLE__ )
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/* Include darwin_specific.h here if needed */
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#endif

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/** FIXME This is quite ugly but needed while we don't have counters
 * helpers */
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//#include "input/input_internal.h"
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#include <libvlc.h>
#include <vlc_input.h>
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#include "vout_pictures.h"
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#include "vout_internal.h"
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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static int      InitThread        ( vout_thread_t * );
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static void*    RunThread         ( void *  );
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static void     ErrorThread       ( vout_thread_t * );
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static void     CleanThread       ( vout_thread_t * );
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static void     EndThread         ( vout_thread_t * );
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static void     AspectRatio       ( int, int *, int * );
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static void VideoFormatImportRgb( video_format_t *, const picture_heap_t * );
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static void PictureHeapFixRgb( picture_heap_t * );

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static void     vout_Destructor   ( vlc_object_t * p_this );

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/* Object variables callbacks */
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static int FilterCallback( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
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static int VideoFilter2Callback( vlc_object_t *, char const *,
                                 vlc_value_t, vlc_value_t, void * );
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/* */
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static void PostProcessEnable( vout_thread_t * );
static void PostProcessDisable( vout_thread_t * );
static void PostProcessSetFilterQuality( vout_thread_t *p_vout );
static int  PostProcessCallback( vlc_object_t *, char const *,
                                 vlc_value_t, vlc_value_t, void * );
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/* */
static void DeinterlaceEnable( vout_thread_t * );
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/* From vout_intf.c */
int vout_Snapshot( vout_thread_t *, picture_t * );

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/* Display media title in OSD */
static void DisplayTitleOnOSD( vout_thread_t *p_vout );

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/* Time during which the thread will sleep if it has nothing to
 * display (in micro-seconds) */
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#define VOUT_IDLE_SLEEP                 ((int)(0.020*CLOCK_FREQ))
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/* Maximum lap of time allowed between the beginning of rendering and
 * display. If, compared to the current date, the next image is too
 * late, the thread will perform an idle loop. This time should be
 * at least VOUT_IDLE_SLEEP plus the time required to render a few
 * images, to avoid trashing of decoded images */
#define VOUT_DISPLAY_DELAY              ((int)(0.200*CLOCK_FREQ))

/* Better be in advance when awakening than late... */
#define VOUT_MWAIT_TOLERANCE            ((mtime_t)(0.020*CLOCK_FREQ))

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/* Minimum number of direct pictures the video output will accept without
 * creating additional pictures in system memory */
#ifdef OPTIMIZE_MEMORY
#   define VOUT_MIN_DIRECT_PICTURES        (VOUT_MAX_PICTURES/2)
#else
#   define VOUT_MIN_DIRECT_PICTURES        (3*VOUT_MAX_PICTURES/4)
#endif

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/*****************************************************************************
 * Video Filter2 functions
 *****************************************************************************/
static picture_t *video_new_buffer_filter( filter_t *p_filter )
{
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    vout_thread_t *p_vout = (vout_thread_t*)p_filter->p_owner;
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    picture_t *p_picture = vout_CreatePicture( p_vout, 0, 0, 0 );
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    p_picture->i_status = READY_PICTURE;
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    return p_picture;
}

static void video_del_buffer_filter( filter_t *p_filter, picture_t *p_pic )
{
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    vout_thread_t *p_vout = (vout_thread_t*)p_filter->p_owner;

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    vlc_mutex_lock( &p_vout->picture_lock );
    vout_UsePictureLocked( p_vout, p_pic );
    vlc_mutex_unlock( &p_vout->picture_lock );
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}

static int video_filter_buffer_allocation_init( filter_t *p_filter, void *p_data )
{
    p_filter->pf_vout_buffer_new = video_new_buffer_filter;
    p_filter->pf_vout_buffer_del = video_del_buffer_filter;
    p_filter->p_owner = p_data; /* p_vout */
    return VLC_SUCCESS;
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}

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/*****************************************************************************
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 * vout_Request: find a video output thread, create one, or destroy one.
 *****************************************************************************
 * This function looks for a video output thread matching the current
 * properties. If not found, it spawns a new one.
 *****************************************************************************/
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vout_thread_t *__vout_Request( vlc_object_t *p_this, vout_thread_t *p_vout,
                               video_format_t *p_fmt )
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{
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    if( !p_fmt )
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    {
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        /* Video output is no longer used.
         * TODO: support for reusing video outputs with proper _thread-safe_
         * reference handling. */
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        if( p_vout )
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            vout_CloseAndRelease( p_vout );
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        return NULL;
    }

    /* If a video output was provided, lock it, otherwise look for one. */
    if( p_vout )
    {
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        vlc_object_hold( p_vout );
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    }

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    /* TODO: find a suitable unused video output */
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    /* If we now have a video output, check it has the right properties */
    if( p_vout )
    {
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        vlc_mutex_lock( &p_vout->change_lock );

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        /* We don't directly check for the "vout-filter" variable for obvious
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         * performance reasons. */
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        if( p_vout->p->b_filter_change )
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        {
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            char *psz_filter_chain = var_GetString( p_vout, "vout-filter" );
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            if( psz_filter_chain && !*psz_filter_chain )
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            {
                free( psz_filter_chain );
                psz_filter_chain = NULL;
            }
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            if( p_vout->p->psz_filter_chain && !*p_vout->p->psz_filter_chain )
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            {
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                free( p_vout->p->psz_filter_chain );
                p_vout->p->psz_filter_chain = NULL;
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            }

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            if( !psz_filter_chain && !p_vout->p->psz_filter_chain )
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            {
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                p_vout->p->b_filter_change = false;
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            }

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            free( psz_filter_chain );
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        }

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        if( p_vout->fmt_render.i_chroma != vlc_fourcc_GetCodec( VIDEO_ES, p_fmt->i_chroma ) ||
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            p_vout->fmt_render.i_width != p_fmt->i_width ||
            p_vout->fmt_render.i_height != p_fmt->i_height ||
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            p_vout->p->b_filter_change )
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        {
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            vlc_mutex_unlock( &p_vout->change_lock );

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            /* We are not interested in this format, close this vout */
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            vout_CloseAndRelease( p_vout );
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            vlc_object_release( p_vout );
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            p_vout = NULL;
        }
        else
        {
            /* This video output is cool! Hijack it. */
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            if( p_vout->fmt_render.i_aspect != p_fmt->i_aspect )
            {
                /* Correct aspect ratio on change
                 * FIXME factorize this code with other aspect ration related code */
                unsigned int i_sar_num;
                unsigned int i_sar_den;
                unsigned int i_aspect;

                i_aspect = p_fmt->i_aspect;
                vlc_ureduce( &i_sar_num, &i_sar_den,
                             p_fmt->i_sar_num, p_fmt->i_sar_den, 50000 );
#if 0
                /* What's that, it does not seems to be used correcly everywhere
                 * beside the previous p_vout->fmt_render.i_aspect != p_fmt->i_aspect
                 * should be fixed to use it too then */
                if( p_vout->i_par_num > 0 && p_vout->i_par_den > 0 )
                {
                    i_sar_num *= p_vout->i_par_den;
                    i_sar_den *= p_vout->i_par_num;
                    i_aspect = i_aspect * p_vout->i_par_den / p_vout->i_par_num;
                }
#endif

                if( i_sar_num > 0 && i_sar_den > 0 && i_aspect > 0 )
                {
                    p_vout->fmt_in.i_sar_num = i_sar_num;
                    p_vout->fmt_in.i_sar_den = i_sar_den;
                    p_vout->fmt_in.i_aspect  = i_aspect;

                    p_vout->fmt_render.i_sar_num = i_sar_num;
                    p_vout->fmt_render.i_sar_den = i_sar_den;
                    p_vout->fmt_render.i_aspect  = i_aspect;

                    p_vout->render.i_aspect   = i_aspect;

                    p_vout->i_changes |= VOUT_ASPECT_CHANGE;

                }
            }
            vlc_mutex_unlock( &p_vout->change_lock );

            vlc_object_release( p_vout );
        }

        if( p_vout )
        {
            msg_Dbg( p_this, "reusing provided vout" );

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            spu_Attach( p_vout->p_spu, VLC_OBJECT(p_vout), false );
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            vlc_object_detach( p_vout );
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            vlc_object_attach( p_vout, p_this );
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            spu_Attach( p_vout->p_spu, VLC_OBJECT(p_vout), true );
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        }
    }

    if( !p_vout )
    {
        msg_Dbg( p_this, "no usable vout present, spawning one" );

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        p_vout = vout_Create( p_this, p_fmt );
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    }

    return p_vout;
}

/*****************************************************************************
 * vout_Create: 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_Create( vlc_object_t *p_parent, video_format_t *p_fmt )
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{
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    vout_thread_t  * p_vout;                            /* thread descriptor */
    int              i_index;                               /* loop variable */
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    vlc_value_t      text;
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    unsigned int i_width = p_fmt->i_width;
    unsigned int i_height = p_fmt->i_height;
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    vlc_fourcc_t i_chroma = vlc_fourcc_GetCodec( VIDEO_ES, p_fmt->i_chroma );
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    unsigned int i_aspect = p_fmt->i_aspect;

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    config_chain_t *p_cfg;
    char *psz_parser;
    char *psz_name;

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    if( i_width <= 0 || i_height <= 0 || i_aspect <= 0 )
        return NULL;

    vlc_ureduce( &p_fmt->i_sar_num, &p_fmt->i_sar_den,
                 p_fmt->i_sar_num, p_fmt->i_sar_den, 50000 );
    if( p_fmt->i_sar_num <= 0 || p_fmt->i_sar_den <= 0 )
        return NULL;

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    /* Allocate descriptor */
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    static const char typename[] = "video output";
    p_vout = vlc_custom_create( p_parent, sizeof( *p_vout ), VLC_OBJECT_VOUT,
                                typename );
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    if( p_vout == NULL )
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        return NULL;
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    /* */
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    p_vout->p = calloc( 1, sizeof(*p_vout->p) );
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    if( !p_vout->p )
    {
        vlc_object_release( p_vout );
        return NULL;
    }

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    /* Initialize pictures - 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 + 1; i_index++)
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    {
        p_vout->p_picture[i_index].pf_lock = NULL;
        p_vout->p_picture[i_index].pf_unlock = NULL;
        p_vout->p_picture[i_index].i_status = FREE_PICTURE;
        p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
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        p_vout->p_picture[i_index].b_slow   = 0;
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    }

    /* No images in the heap */
    p_vout->i_heap_size = 0;

    /* Initialize the rendering heap */
    I_RENDERPICTURES = 0;
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    p_vout->fmt_render        = *p_fmt;   /* FIXME palette */
    p_vout->fmt_in            = *p_fmt;   /* FIXME palette */
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    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    = p_fmt->i_rmask;
    p_vout->render.i_gmask    = p_fmt->i_gmask;
    p_vout->render.i_bmask    = p_fmt->i_bmask;
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    p_vout->render.i_last_used_pic = -1;
    p_vout->render.b_allow_modify_pics = 1;

    /* 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;

    /* Initialize misc stuff */
    p_vout->i_changes    = 0;
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    p_vout->b_autoscale  = 1;
    p_vout->i_zoom      = ZOOM_FP_FACTOR;
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    p_vout->b_fullscreen = 0;
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    p_vout->i_alignment  = 0;
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    p_vout->p->render_time  = 10;
    p_vout->p->c_fps_samples = 0;
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    p_vout->p->i_picture_lost = 0;
    p_vout->p->i_picture_displayed = 0;
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    p_vout->p->b_filter_change = 0;
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    p_vout->p->b_paused = false;
    p_vout->p->i_pause_date = 0;
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    p_vout->pf_control = NULL;
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    p_vout->p->i_par_num =
    p_vout->p->i_par_den = 1;
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    p_vout->p->p_picture_displayed = NULL;
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    p_vout->p->i_picture_displayed_date = 0;
    p_vout->p->b_picture_displayed = false;
    p_vout->p->b_picture_empty = false;
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    p_vout->p->i_picture_qtype = QTYPE_NONE;
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    vout_snapshot_Init( &p_vout->p->snapshot );
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    /* Initialize locks */
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    vlc_mutex_init( &p_vout->picture_lock );
    vlc_cond_init( &p_vout->p->picture_wait );
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    vlc_mutex_init( &p_vout->change_lock );
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    vlc_mutex_init( &p_vout->p->vfilter_lock );
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    /* Mouse coordinates */
    var_Create( p_vout, "mouse-x", VLC_VAR_INTEGER );
    var_Create( p_vout, "mouse-y", VLC_VAR_INTEGER );
    var_Create( p_vout, "mouse-button-down", VLC_VAR_INTEGER );
    var_Create( p_vout, "mouse-moved", VLC_VAR_BOOL );
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    var_Create( p_vout, "mouse-clicked", VLC_VAR_BOOL );
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    /* Initialize subpicture unit */
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    p_vout->p_spu = spu_Create( p_vout );
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    /* Attach the new object now so we can use var inheritance below */
    vlc_object_attach( p_vout, p_parent );

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    /* */
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    spu_Init( p_vout->p_spu );

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    spu_Attach( p_vout->p_spu, VLC_OBJECT(p_vout), true );

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    /* Take care of some "interface/control" related initialisations */
    vout_IntfInit( p_vout );
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    /* If the parent is not a VOUT object, that means we are at the start of
     * the video output pipe */
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    if( vlc_internals( p_parent )->i_object_type != VLC_OBJECT_VOUT )
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    {
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        /* Look for the default filter configuration */
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        p_vout->p->psz_filter_chain =
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            var_CreateGetStringCommand( p_vout, "vout-filter" );
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        /* Apply video filter2 objects on the first vout */
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        p_vout->p->psz_vf2 =
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            var_CreateGetStringCommand( p_vout, "video-filter" );
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        p_vout->p->b_first_vout = true;
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    }
    else
    {
        /* continue the parent's filter chain */
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        char *psz_tmp;
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        /* Ugly hack to jump to our configuration chain */
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        p_vout->p->psz_filter_chain
            = ((vout_thread_t *)p_parent)->p->psz_filter_chain;
        p_vout->p->psz_filter_chain
            = config_ChainCreate( &psz_tmp, &p_cfg, p_vout->p->psz_filter_chain );
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        config_ChainDestroy( p_cfg );
        free( psz_tmp );
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        /* Create a video filter2 var ... but don't inherit values */
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        var_Create( p_vout, "video-filter",
                    VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
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        p_vout->p->psz_vf2 = var_GetString( p_vout, "video-filter" );
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        /* */
        p_vout->p->b_first_vout = false;
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    }

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    var_AddCallback( p_vout, "video-filter", VideoFilter2Callback, NULL );
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    p_vout->p->p_vf2_chain = filter_chain_New( p_vout, "video filter2",
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        false, video_filter_buffer_allocation_init, NULL, p_vout );
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    /* Choose the video output module */
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    if( !p_vout->p->psz_filter_chain || !*p_vout->p->psz_filter_chain )
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    {
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        psz_parser = var_CreateGetString( p_vout, "vout" );
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    }
    else
    {
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        psz_parser = strdup( p_vout->p->psz_filter_chain );
        p_vout->p->b_title_show = false;
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    }

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    /* Create the vout thread */
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    char* psz_tmp = config_ChainCreate( &psz_name, &p_cfg, psz_parser );
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    free( psz_parser );
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    free( psz_tmp );
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    p_vout->p_cfg = p_cfg;
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    p_vout->p_module = module_need( p_vout,
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        ( p_vout->p->psz_filter_chain && *p_vout->p->psz_filter_chain ) ?
        "video filter" : "video output", psz_name, p_vout->p->psz_filter_chain && *p_vout->p->psz_filter_chain );
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    free( psz_name );
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    vlc_object_set_destructor( p_vout, vout_Destructor );

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    if( p_vout->p_module == NULL )
    {
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        msg_Err( p_vout, "no suitable vout module" );
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        spu_Attach( p_vout->p_spu, VLC_OBJECT(p_vout), false );
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        spu_Destroy( p_vout->p_spu );
        p_vout->p_spu = NULL;
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        vlc_object_release( p_vout );
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        return NULL;
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    }
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    /* Create a few object variables for interface interaction */
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    var_Create( p_vout, "vout-filter", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
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    text.psz_string = _("Filters");
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    var_Change( p_vout, "vout-filter", VLC_VAR_SETTEXT, &text, NULL );
    var_AddCallback( p_vout, "vout-filter", FilterCallback, NULL );
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    /* */
    DeinterlaceEnable( p_vout );

    /* */
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    vlc_cond_init( &p_vout->p->change_wait );
    if( vlc_clone( &p_vout->p->thread, RunThread, p_vout,
                   VLC_THREAD_PRIORITY_OUTPUT ) )
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    {
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        module_unneed( p_vout, p_vout->p_module );
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        p_vout->p_module = NULL;
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        spu_Attach( p_vout->p_spu, VLC_OBJECT(p_vout), false );
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        spu_Destroy( p_vout->p_spu );
        p_vout->p_spu = NULL;
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        vlc_object_release( p_vout );
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        return NULL;
    }

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    vlc_mutex_lock( &p_vout->change_lock );
    while( !p_vout->p->b_ready )
    {   /* We are (ab)using the same condition in opposite directions for
         * b_ready and b_done. This works because of the strict ordering. */
        assert( !p_vout->p->b_done );
        vlc_cond_wait( &p_vout->p->change_wait, &p_vout->change_lock );
    }
    vlc_mutex_unlock( &p_vout->change_lock );

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    if( p_vout->b_error )
    {
        msg_Err( p_vout, "video output creation failed" );
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        vout_CloseAndRelease( p_vout );
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        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_Close: Close a vout created by vout_Create.
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 *****************************************************************************
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 * You HAVE to call it on vout created by vout_Create before vlc_object_release.
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 * You should NEVER call it on vout not obtained through vout_Create
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 * (like with vout_Request or vlc_object_find.)
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 * You can use vout_CloseAndRelease() as a convenience method.
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 *****************************************************************************/
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void vout_Close( vout_thread_t *p_vout )
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{
    assert( p_vout );

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    vlc_mutex_lock( &p_vout->change_lock );
    p_vout->p->b_done = true;
    vlc_cond_signal( &p_vout->p->change_wait );
    vlc_mutex_unlock( &p_vout->change_lock );
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    vout_snapshot_End( &p_vout->p->snapshot );
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    vlc_join( p_vout->p->thread, NULL );
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    module_unneed( p_vout, p_vout->p_module );
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    p_vout->p_module = NULL;
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}

/* */
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static void vout_Destructor( vlc_object_t * p_this )
{
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    vout_thread_t *p_vout = (vout_thread_t *)p_this;
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    /* Make sure the vout was stopped first */
    assert( !p_vout->p_module );

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    /* */
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    if( p_vout->p_spu )
        spu_Destroy( p_vout->p_spu );
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    /* Destroy the locks */
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    vlc_cond_destroy( &p_vout->p->change_wait );
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    vlc_cond_destroy( &p_vout->p->picture_wait );
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    vlc_mutex_destroy( &p_vout->picture_lock );
    vlc_mutex_destroy( &p_vout->change_lock );
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    vlc_mutex_destroy( &p_vout->p->vfilter_lock );
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    /* */
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    vout_snapshot_Clean( &p_vout->p->snapshot );
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    /* */
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    free( p_vout->p->psz_filter_chain );
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    free( p_vout->p->psz_title );
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    config_ChainDestroy( p_vout->p_cfg );

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    free( p_vout->p );

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#ifndef __APPLE__
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    vout_thread_t *p_another_vout;
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    /* This is a dirty hack mostly for Linux, where there is no way to get the
     * GUI back if you closed it while playing video. This is solved in
     * Mac OS X, where we have this novelty called menubar, that will always
     * allow you access to the applications main functionality. They should try
     * that on linux sometime. */
    p_another_vout = vlc_object_find( p_this->p_libvlc,
                                      VLC_OBJECT_VOUT, FIND_ANYWHERE );
    if( p_another_vout == NULL )
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        var_SetBool( p_this->p_libvlc, "intf-show", true );
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    else
        vlc_object_release( p_another_vout );
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#endif
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}

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/* */
void vout_ChangePause( vout_thread_t *p_vout, bool b_paused, mtime_t i_date )
{
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    vlc_mutex_lock( &p_vout->change_lock );
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    assert( !p_vout->p->b_paused || !b_paused );
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    vlc_mutex_lock( &p_vout->picture_lock );

    p_vout->p->i_picture_displayed_date = 0;

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    if( p_vout->p->b_paused )
    {
        const mtime_t i_duration = i_date - p_vout->p->i_pause_date;

        for( int i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
        {
            picture_t *p_pic = PP_RENDERPICTURE[i_index];

            if( p_pic->i_status == READY_PICTURE )
                p_pic->date += i_duration;
        }
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        vlc_cond_signal( &p_vout->p->picture_wait );
        vlc_mutex_unlock( &p_vout->picture_lock );

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        spu_OffsetSubtitleDate( p_vout->p_spu, i_duration );
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    }
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    else
    {
        vlc_mutex_unlock( &p_vout->picture_lock );
    }
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    p_vout->p->b_paused = b_paused;
    p_vout->p->i_pause_date = i_date;

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    vlc_mutex_unlock( &p_vout->change_lock );
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}
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void vout_GetResetStatistic( vout_thread_t *p_vout, int *pi_displayed, int *pi_lost )
{
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    vlc_mutex_lock( &p_vout->change_lock );
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    *pi_displayed = p_vout->p->i_picture_displayed;
    *pi_lost = p_vout->p->i_picture_lost;

    p_vout->p->i_picture_displayed = 0;
    p_vout->p->i_picture_lost = 0;

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    vlc_mutex_unlock( &p_vout->change_lock );
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}
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void vout_Flush( vout_thread_t *p_vout, mtime_t i_date )
{
    vlc_mutex_lock( &p_vout->picture_lock );
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    p_vout->p->i_picture_displayed_date = 0;
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    for( int i = 0; i < p_vout->render.i_pictures; i++ )
    {
        picture_t *p_pic = p_vout->render.pp_picture[i];
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        if( p_pic->i_status == READY_PICTURE ||
            p_pic->i_status == DISPLAYED_PICTURE )
        {
            /* We cannot change picture status if it is in READY_PICTURE state,
             * Just make sure they won't be displayed */
            if( p_pic->date > i_date )
                p_pic->date = i_date;
        }
    }
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    vlc_cond_signal( &p_vout->p->picture_wait );
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    vlc_mutex_unlock( &p_vout->picture_lock );
}
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void vout_FixLeaks( vout_thread_t *p_vout, bool b_forced )
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{
    int i_pic, i_ready_pic;

    vlc_mutex_lock( &p_vout->picture_lock );

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    for( i_pic = 0, i_ready_pic = 0; i_pic < p_vout->render.i_pictures && !b_forced; i_pic++ )
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    {
        const picture_t *p_pic = p_vout->render.pp_picture[i_pic];

        if( p_pic->i_status == READY_PICTURE )
        {
            i_ready_pic++;
            /* If we have at least 2 ready pictures, wait for the vout thread to
             * process one */
            if( i_ready_pic >= 2 )
                break;

            continue;
        }

        if( p_pic->i_status == DISPLAYED_PICTURE )
        {
            /* If at least one displayed picture is not referenced
             * let vout free it */
            if( p_pic->i_refcount == 0 )
                break;
        }
    }
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    if( i_pic < p_vout->render.i_pictures && !b_forced )
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    {
        vlc_mutex_unlock( &p_vout->picture_lock );
        return;
    }

    /* Too many pictures are still referenced, there is probably a bug
     * with the decoder */
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    if( !b_forced )
        msg_Err( p_vout, "pictures leaked, resetting the heap" );
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    /* Just free all the pictures */
    for( i_pic = 0; i_pic < p_vout->render.i_pictures; i_pic++ )
    {
        picture_t *p_pic = p_vout->render.pp_picture[i_pic];
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        msg_Dbg( p_vout, "[%d] %d %d", i_pic, p_pic->i_status, p_pic->i_refcount );
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        p_pic->i_refcount = 0;
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        switch( p_pic->i_status )
        {
        case READY_PICTURE:
        case DISPLAYED_PICTURE:
        case RESERVED_PICTURE:
            if( p_pic != p_vout->p->p_picture_displayed )
                vout_UsePictureLocked( p_vout, p_pic );
            break;
        }
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    }
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    vlc_cond_signal( &p_vout->p->picture_wait );
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    vlc_mutex_unlock( &p_vout->picture_lock );
}
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void vout_NextPicture( vout_thread_t *p_vout, mtime_t *pi_duration )
{
    vlc_mutex_lock( &p_vout->picture_lock );

    const mtime_t i_displayed_date = p_vout->p->i_picture_displayed_date;

    p_vout->p->b_picture_displayed = false;
    p_vout->p->b_picture_empty = false;
    if( p_vout->p->p_picture_displayed )
    {
        p_vout->p->p_picture_displayed->date = 1;
        vlc_cond_signal( &p_vout->p->picture_wait );
    }

    while( !p_vout->p->b_picture_displayed && !p_vout->p->b_picture_empty )
        vlc_cond_wait( &p_vout->p->picture_wait, &p_vout->picture_lock );

    *pi_duration = __MAX( p_vout->p->i_picture_displayed_date - i_displayed_date, 0 );

    /* TODO advance subpicture by the duration ... */

    vlc_mutex_unlock( &p_vout->picture_lock );
}
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void vout_DisplayTitle( vout_thread_t *p_vout, const char *psz_title )
{
    assert( psz_title );

    if( !config_GetInt( p_vout, "osd" ) )
        return;

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    vlc_mutex_lock( &p_vout->change_lock );
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    free( p_vout->p->psz_title );
    p_vout->p->psz_title = strdup( psz_title );
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    vlc_mutex_unlock( &p_vout->change_lock );
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}
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spu_t *vout_GetSpu( vout_thread_t *p_vout )
{
    return p_vout->p_spu;
}

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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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 * XXX You have to enter it with change_lock taken.
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 *****************************************************************************/
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static int ChromaCreate( vout_thread_t *p_vout );
static void ChromaDestroy( vout_thread_t *p_vout );
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static bool ChromaIsEqual( const picture_heap_t *p_output, const picture_heap_t *p_render )
{
     if( !vout_ChromaCmp( p_output->i_chroma, p_render->i_chroma ) )
         return false;

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     if( p_output->i_chroma != VLC_CODEC_RGB15 &&
         p_output->i_chroma != VLC_CODEC_RGB16 &&
         p_output->i_chroma != VLC_CODEC_RGB24 &&
         p_output->i_chroma != VLC_CODEC_RGB32 )
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         return true;

     return p_output->i_rmask == p_render->i_rmask &&
            p_output->i_gmask == p_render->i_gmask &&
            p_output->i_bmask == p_render->i_bmask;
}

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static int InitThread( vout_thread_t *p_vout )
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{
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    int i, i_aspect_x, i_aspect_y;
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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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        return VLC_EGENERIC;
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    p_vout->p->p_picture_displayed = NULL;

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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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        return VLC_EGENERIC;
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    }
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    if( I_OUTPUTPICTURES > VOUT_MAX_PICTURES )
    {
        msg_Err( p_vout, "plugin allocated too many direct buffers, "
                         "our internal buffers must have overflown." );
        p_vout->pf_end( p_vout );
        return VLC_EGENERIC;
    }

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    msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
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    AspectRatio( p_vout->fmt_render.i_aspect, &i_aspect_x, &i_aspect_y );

    AspectRatio( p_vout->fmt_in.i_aspect, &i_aspect_x, &i_aspect_y );

    if( !p_vout->fmt_out.i_width || !p_vout->fmt_out.i_height )
    {
        p_vout->fmt_out.i_width = p_vout->fmt_out.i_visible_width =
            p_vout->output.i_width;
        p_vout->fmt_out.i_height = p_vout->fmt_out.i_visible_height =
            p_vout->output.i_height;
        p_vout->fmt_out.i_x_offset =  p_vout->fmt_out.i_y_offset = 0;

        p_vout->fmt_out.i_aspect = p_vout->output.i_aspect;
        p_vout->fmt_out.i_chroma = p_vout->output.i_chroma;
    }
    if( !p_vout->fmt_out.i_sar_num || !p_vout->fmt_out.i_sar_num )
    {
        p_vout->fmt_out.i_sar_num = p_vout->fmt_out.i_aspect *
            p_vout->fmt_out.i_height;
        p_vout->fmt_out.i_sar_den = VOUT_ASPECT_FACTOR *
            p_vout->fmt_out.i_width;
    }

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    vlc_ureduce( &p_vout->fmt_out.i_sar_num, &p_vout->fmt_out.i_sar_den,
                 p_vout->fmt_out.i_sar_num, p_vout->fmt_out.i_sar_den, 0 );
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    AspectRatio( p_vout->fmt_out.i_aspect, &i_aspect_x, &i_aspect_y );
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    /* FIXME removed the need of both fmt_* and heap infos */
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    /* Calculate shifts from system-updated masks */
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    PictureHeapFixRgb( &p_vout->render );
    VideoFormatImportRgb( &p_vout->fmt_render, &p_vout->render );

    PictureHeapFixRgb( &p_vout->output );
    VideoFormatImportRgb( &p_vout->fmt_out, &p_vout->output );
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    /* print some usefull debug info about different vout formats
     */
    msg_Dbg( p_vout, "pic render sz %ix%i, of (%i,%i), vsz %ix%i, 4cc %4.4s, ar %i:%i, sar %i:%i, msk r0x%x g0x%x b0x%x",
             p_vout->fmt_render.i_width, p_vout->fmt_render.i_height,
             p_vout->fmt_render.i_x_offset, p_vout->fmt_render.i_y_offset,
             p_vout->fmt_render.i_visible_width,
             p_vout->fmt_render.i_visible_height,
             (char*)&p_vout->fmt_render.i_chroma,
             i_aspect_x, i_aspect_y,
             p_vout->fmt_render.i_sar_num, p_vout->fmt_render.i_sar_den,
             p_vout->fmt_render.i_rmask, p_vout->fmt_render.i_gmask, p_vout->fmt_render.i_bmask );

    msg_Dbg( p_vout, "pic in sz %ix%i, of (%i,%i), vsz %ix%i, 4cc %4.4s, ar %i:%i, sar %i:%i, msk r0x%x g0x%x b0x%x",
             p_vout->fmt_in.i_width, p_vout->fmt_in.i_height,
             p_vout->fmt_in.i_x_offset, p_vout->fmt_in.i_y_offset,
             p_vout->fmt_in.i_visible_width,
             p_vout->fmt_in.i_visible_height,
             (char*)&p_vout->fmt_in.i_chroma,
             i_aspect_x, i_aspect_y,
             p_vout->fmt_in.i_sar_num, p_vout->fmt_in.i_sar_den,
             p_vout->fmt_in.i_rmask, p_vout->fmt_in.i_gmask, p_vout->fmt_in.i_bmask );

    msg_Dbg( p_vout, "pic out sz %ix%i, of (%i,%i), vsz %ix%i, 4cc %4.4s, ar %i:%i, sar %i:%i, msk r0x%x g0x%x b0x%x",
             p_vout->fmt_out.i_width, p_vout->fmt_out.i_height,
             p_vout->fmt_out.i_x_offset, p_vout->fmt_out.i_y_offset,
             p_vout->fmt_out.i_visible_width,
             p_vout->fmt_out.i_visible_height,
             (char*)&p_vout->fmt_out.i_chroma,
             i_aspect_x, i_aspect_y,
             p_vout->fmt_out.i_sar_num, p_vout->fmt_out.i_sar_den,
             p_vout->fmt_out.i_rmask, p_vout->fmt_out.i_gmask, p_vout->fmt_out.i_bmask );

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    /* Check whether we managed to create direct buffers similar to
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     * the render buffers, ie same size and chroma */
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    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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     && ( ChromaIsEqual( &p_vout->output, &p_vout->render ) ) )
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    {
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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->p->b_direct = true;
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        for( i = 1; i < VOUT_MAX_PICTURES; i++ )
        {
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            if( p_vout->p_picture[ i ].i_type != DIRECT_PICTURE &&
                I_RENDERPICTURES >= VOUT_MIN_DIRECT_PICTURES - 1 &&
                p_vout->p_picture[ i - 1 ].i_type == DIRECT_PICTURE )
            {
                /* We have enough direct buffers so there's no need to
                 * try to use system memory buffers. */
                break;
            }
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            PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
            I_RENDERPICTURES++;
        }
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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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    }
    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->p->b_direct = false;
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        if( ChromaCreate( p_vout ) )
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        {
            p_vout->pf_end( p_vout );
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            return VLC_EGENERIC;
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        }
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        msg_Dbg( p_vout, "indirect render, mapping "
                 "render pictures 0-%i to system pictures %i-%i",
                 VOUT_MAX_PICTURES - 1, I_OUTPUTPICTURES,
                 I_OUTPUTPICTURES + VOUT_MAX_PICTURES - 1 );
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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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            /* Check if we have enough render pictures */
            if( I_RENDERPICTURES == VOUT_MAX_PICTURES )
                break;
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        }
    }
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    return VLC_SUCCESS;
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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( void *p_this )
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{
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    vout_thread_t *p_vout = p_this;
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    int             i_idle_loops = 0;  /* loops without displaying a picture */
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    int             i_picture_qtype_last = QTYPE_NONE;
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    bool            b_drop_late;
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    /*
     * Initialize thread
     */
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    vlc_mutex_lock( &p_vout->change_lock );
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    p_vout->b_error = InitThread( p_vout );
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    b_drop_late = var_CreateGetBool( p_vout, "drop-late-frames" );
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    /* signal the creation of the vout */
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    p_vout->p->b_ready = true;
    vlc_cond_signal( &p_vout->p->change_wait );
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    if( p_vout->b_error )
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    {
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        EndThread( p_vout );
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        vlc_mutex_unlock( &p_vout->change_lock );
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        return NULL;
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    }
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    /*
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     * Main loop - it is not executed if an error occurred during
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     * initialization
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     */
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    while( !p_vout->p->b_done && !p_vout->b_error )
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    {
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        /* Initialize loop variables */
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        const mtime_t current_date = mdate();