video_output.c

/*****************************************************************************
 * 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
 * thread, and destroy a previously oppened video output thread.
 *****************************************************************************
 * Copyright (C) 2000-2007 the VideoLAN team
 * $Id$
 *
 * Authors: Vincent Seguin <seguin@via.ecp.fr>
 *          Gildas Bazin <gbazin@videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>

#include <stdlib.h>                                                /* free() */
#include <string.h>

#include <vlc_vout.h>

#include <vlc_filter.h>
#include <vlc_osd.h>
#include <assert.h>

#if defined( __APPLE__ )
/* Include darwin_specific.h here if needed */
#endif

/** FIXME This is quite ugly but needed while we don't have counters
 * helpers */
//#include "input/input_internal.h"

#include <libvlc.h>
#include <vlc_input.h>
#include "vout_pictures.h"
#include "vout_internal.h"

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int      InitThread        ( vout_thread_t * );
static void*    RunThread         ( void *  );
static void     ErrorThread       ( vout_thread_t * );
static void     CleanThread       ( vout_thread_t * );
static void     EndThread         ( vout_thread_t * );

static void VideoFormatImportRgb( video_format_t *, const picture_heap_t * );
static void PictureHeapFixRgb( picture_heap_t * );

static void     vout_Destructor   ( vlc_object_t * p_this );

/* Object variables callbacks */
static int FilterCallback( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int VideoFilter2Callback( vlc_object_t *, char const *,
                                 vlc_value_t, vlc_value_t, void * );

/* */
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 * );
/* */
static void DeinterlaceEnable( vout_thread_t * );
static void DeinterlaceNeeded( vout_thread_t *, bool );

/* From vout_intf.c */
int vout_Snapshot( vout_thread_t *, picture_t * );

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

/* Time during which the thread will sleep if it has nothing to
 * display (in micro-seconds) */
#define VOUT_IDLE_SLEEP                 ((int)(0.020*CLOCK_FREQ))

/* 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))

/* 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

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

    p_picture->i_status = READY_PICTURE;

    return p_picture;
}

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

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

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

#undef vout_Request
/*****************************************************************************
 * 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.
 *****************************************************************************/
vout_thread_t *vout_Request( vlc_object_t *p_this, vout_thread_t *p_vout,
                             video_format_t *p_fmt )
{
    if( !p_fmt )
    {
        /* Video output is no longer used.
         * TODO: support for reusing video outputs with proper _thread-safe_
         * reference handling. */
        if( p_vout )
            vout_CloseAndRelease( p_vout );
        return NULL;
    }

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

    /* TODO: find a suitable unused video output */

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

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

            if( psz_filter_chain && !*psz_filter_chain )
            {
                free( psz_filter_chain );
                psz_filter_chain = NULL;
            }
            if( p_vout->p->psz_filter_chain && !*p_vout->p->psz_filter_chain )
            {
                free( p_vout->p->psz_filter_chain );
                p_vout->p->psz_filter_chain = NULL;
            }

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

            free( psz_filter_chain );
        }

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

            /* We are not interested in this format, close this vout */
            vout_CloseAndRelease( p_vout );
            vlc_object_release( p_vout );
            p_vout = NULL;
        }
        else
        {
            /* This video output is cool! Hijack it. */
            /* 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;
            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 */
            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;
            }
#endif

            if( i_sar_num > 0 && i_sar_den > 0 &&
                ( i_sar_num != p_vout->fmt_render.i_sar_num ||
                  i_sar_den != p_vout->fmt_render.i_sar_den ) )
            {
                p_vout->fmt_in.i_sar_num = i_sar_num;
                p_vout->fmt_in.i_sar_den = i_sar_den;

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

                p_vout->render.i_aspect = (int64_t)i_sar_num *
                                                   p_vout->fmt_render.i_width *
                                                   VOUT_ASPECT_FACTOR /
                                                   i_sar_den /
                                                   p_vout->fmt_render.i_height;
                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" );

            spu_Attach( p_vout->p_spu, VLC_OBJECT(p_vout), false );
            vlc_object_detach( p_vout );

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

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

        p_vout = vout_Create( p_this, p_fmt );
    }

    return p_vout;
}

#undef vout_Create
/*****************************************************************************
 * vout_Create: creates a new video output thread
 *****************************************************************************
 * This function creates a new video output thread, and returns a pointer
 * to its description. On error, it returns NULL.
 *****************************************************************************/
vout_thread_t * vout_Create( vlc_object_t *p_parent, video_format_t *p_fmt )
{
    vout_thread_t  * p_vout;                            /* thread descriptor */
    int              i_index;                               /* loop variable */
    vlc_value_t      text;

    unsigned int i_width = p_fmt->i_width;
    unsigned int i_height = p_fmt->i_height;
    vlc_fourcc_t i_chroma = vlc_fourcc_GetCodec( VIDEO_ES, p_fmt->i_chroma );

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

    if( i_width <= 0 || i_height <= 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;
    unsigned int i_aspect = (int64_t)p_fmt->i_sar_num *
                                     i_width *
                                     VOUT_ASPECT_FACTOR /
                                     p_fmt->i_sar_den /
                                     i_height;

    /* Allocate descriptor */
    static const char typename[] = "video output";
    p_vout = vlc_custom_create( p_parent, sizeof( *p_vout ), VLC_OBJECT_VOUT,
                                typename );
    if( p_vout == NULL )
        return NULL;

    /* */
    p_vout->p = calloc( 1, sizeof(*p_vout->p) );
    if( !p_vout->p )
    {
        vlc_object_release( p_vout );
        return NULL;
    }

    /* Initialize pictures - translation tables and functions
     * will be initialized later in InitThread */
    for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES + 1; i_index++)
    {
        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;
        p_vout->p_picture[i_index].b_slow   = 0;
    }

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

    /* Initialize the rendering heap */
    I_RENDERPICTURES = 0;

    p_vout->fmt_render        = *p_fmt;   /* FIXME palette */
    p_vout->fmt_in            = *p_fmt;   /* FIXME palette */

    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;

    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;

    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;
    p_vout->b_autoscale  = 1;
    p_vout->i_zoom      = ZOOM_FP_FACTOR;
    p_vout->b_fullscreen = 0;
    p_vout->i_alignment  = 0;
    p_vout->p->render_time  = 10;
    p_vout->p->c_fps_samples = 0;
    vout_statistic_Init( &p_vout->p->statistic );
    p_vout->p->b_filter_change = 0;
    p_vout->p->b_paused = false;
    p_vout->p->i_pause_date = 0;
    p_vout->pf_control = NULL;
    p_vout->p->i_par_num =
    p_vout->p->i_par_den = 1;
    p_vout->p->p_picture_displayed = NULL;
    p_vout->p->i_picture_displayed_date = 0;
    p_vout->p->b_picture_displayed = false;
    p_vout->p->b_picture_empty = false;
    p_vout->p->i_picture_qtype = QTYPE_NONE;
    p_vout->p->b_picture_interlaced = false;

    vlc_mouse_Init( &p_vout->p->mouse );

    vout_snapshot_Init( &p_vout->p->snapshot );

    /* Initialize locks */
    vlc_mutex_init( &p_vout->picture_lock );
    vlc_cond_init( &p_vout->p->picture_wait );
    vlc_mutex_init( &p_vout->change_lock );
    vlc_mutex_init( &p_vout->p->vfilter_lock );

    /* Mouse coordinates */
    var_Create( p_vout, "mouse-button-down", VLC_VAR_INTEGER );
    var_Create( p_vout, "mouse-moved", VLC_VAR_COORDS );
    var_Create( p_vout, "mouse-clicked", VLC_VAR_COORDS );
    /* Mouse object (area of interest in a video filter) */
    var_Create( p_vout, "mouse-object", VLC_VAR_BOOL );

    /* Initialize subpicture unit */
    p_vout->p_spu = spu_Create( p_vout );

    /* Attach the new object now so we can use var inheritance below */
    vlc_object_attach( p_vout, p_parent );

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

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

    /* Take care of some "interface/control" related initialisations */
    vout_IntfInit( p_vout );

    /* If the parent is not a VOUT object, that means we are at the start of
     * the video output pipe */
    if( vlc_internals( p_parent )->i_object_type != VLC_OBJECT_VOUT )
    {
        /* Look for the default filter configuration */
        p_vout->p->psz_filter_chain =
            var_CreateGetStringCommand( p_vout, "vout-filter" );

        /* Apply video filter2 objects on the first vout */
        p_vout->p->psz_vf2 =
            var_CreateGetStringCommand( p_vout, "video-filter" );

        p_vout->p->b_first_vout = true;
    }
    else
    {
        /* continue the parent's filter chain */
        char *psz_tmp;

        /* Ugly hack to jump to our configuration chain */
        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 );
        config_ChainDestroy( p_cfg );
        free( psz_tmp );

        /* Create a video filter2 var ... but don't inherit values */
        var_Create( p_vout, "video-filter",
                    VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
        p_vout->p->psz_vf2 = var_GetString( p_vout, "video-filter" );

        /* */
        p_vout->p->b_first_vout = false;
    }

    var_AddCallback( p_vout, "video-filter", VideoFilter2Callback, NULL );
    p_vout->p->p_vf2_chain = filter_chain_New( p_vout, "video filter2",
        false, video_filter_buffer_allocation_init, NULL, p_vout );

    /* Choose the video output module */
    if( !p_vout->p->psz_filter_chain || !*p_vout->p->psz_filter_chain )
    {
        psz_parser = NULL;
    }
    else
    {
        psz_parser = strdup( p_vout->p->psz_filter_chain );
        p_vout->p->b_title_show = false;
    }

    /* Create the vout thread */
    char* psz_tmp = config_ChainCreate( &psz_name, &p_cfg, psz_parser );
    free( psz_parser );
    free( psz_tmp );
    p_vout->p_cfg = p_cfg;

    /* Create a few object variables for interface interaction */
    var_Create( p_vout, "vout-filter", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    text.psz_string = _("Filters");
    var_Change( p_vout, "vout-filter", VLC_VAR_SETTEXT, &text, NULL );
    var_AddCallback( p_vout, "vout-filter", FilterCallback, NULL );

    /* */
    DeinterlaceEnable( p_vout );

    if( p_vout->p->psz_filter_chain && *p_vout->p->psz_filter_chain )
        p_vout->p->psz_module_type = "video filter";
    else
        p_vout->p->psz_module_type = "video output";
    p_vout->p->psz_module_name = psz_name;
    p_vout->p_module = NULL;

    /* */
    vlc_object_set_destructor( p_vout, vout_Destructor );

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

    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 );

    if( p_vout->b_error )
    {
        msg_Err( p_vout, "video output creation failed" );
        vout_CloseAndRelease( p_vout );
        return NULL;
    }

    return p_vout;
}

/*****************************************************************************
 * vout_Close: Close a vout created by vout_Create.
 *****************************************************************************
 * You HAVE to call it on vout created by vout_Create before vlc_object_release.
 * You should NEVER call it on vout not obtained through vout_Create
 * (like with vout_Request or vlc_object_find.)
 * You can use vout_CloseAndRelease() as a convenience method.
 *****************************************************************************/
void vout_Close( vout_thread_t *p_vout )
{
    assert( p_vout );

    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 );

    vout_snapshot_End( &p_vout->p->snapshot );

    vlc_join( p_vout->p->thread, NULL );
}

/* */
static void vout_Destructor( vlc_object_t * p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;

    /* Make sure the vout was stopped first */
    assert( !p_vout->p_module );

    free( p_vout->p->psz_module_name );

    /* */
    if( p_vout->p_spu )
        spu_Destroy( p_vout->p_spu );

    /* Destroy the locks */
    vlc_cond_destroy( &p_vout->p->change_wait );
    vlc_cond_destroy( &p_vout->p->picture_wait );
    vlc_mutex_destroy( &p_vout->picture_lock );
    vlc_mutex_destroy( &p_vout->change_lock );
    vlc_mutex_destroy( &p_vout->p->vfilter_lock );

    /* */
    vout_statistic_Clean( &p_vout->p->statistic );

    /* */
    vout_snapshot_Clean( &p_vout->p->snapshot );

    /* */
    free( p_vout->p->psz_filter_chain );
    free( p_vout->p->psz_title );

    config_ChainDestroy( p_vout->p_cfg );

    free( p_vout->p );

}

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

    assert( !p_vout->p->b_paused || !b_paused );

    vlc_mutex_lock( &p_vout->picture_lock );

    p_vout->p->i_picture_displayed_date = 0;

    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;
        }
        vlc_cond_signal( &p_vout->p->picture_wait );
        vlc_mutex_unlock( &p_vout->picture_lock );

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

    vlc_mutex_unlock( &p_vout->change_lock );
}

void vout_GetResetStatistic( vout_thread_t *p_vout, int *pi_displayed, int *pi_lost )
{
    vout_statistic_GetReset( &p_vout->p->statistic,
                             pi_displayed, pi_lost );
}

void vout_Flush( vout_thread_t *p_vout, mtime_t i_date )
{
    vlc_mutex_lock( &p_vout->picture_lock );
    p_vout->p->i_picture_displayed_date = 0;
    for( int i = 0; i < p_vout->render.i_pictures; i++ )
    {
        picture_t *p_pic = p_vout->render.pp_picture[i];

        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;
        }
    }
    vlc_cond_signal( &p_vout->p->picture_wait );
    vlc_mutex_unlock( &p_vout->picture_lock );
}

void vout_FixLeaks( vout_thread_t *p_vout, bool b_forced )
{
    int i_pic, i_ready_pic;

    vlc_mutex_lock( &p_vout->picture_lock );

    for( i_pic = 0, i_ready_pic = 0; i_pic < p_vout->render.i_pictures && !b_forced; i_pic++ )
    {
        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;
        }
    }
    if( i_pic < p_vout->render.i_pictures && !b_forced )
    {
        vlc_mutex_unlock( &p_vout->picture_lock );
        return;
    }

    /* Too many pictures are still referenced, there is probably a bug
     * with the decoder */
    if( !b_forced )
        msg_Err( p_vout, "pictures leaked, resetting the heap" );

    /* 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];

        msg_Dbg( p_vout, "[%d] %d %d", i_pic, p_pic->i_status, p_pic->i_refcount );
        p_pic->i_refcount = 0;

        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;
        }
    }
    vlc_cond_signal( &p_vout->p->picture_wait );
    vlc_mutex_unlock( &p_vout->picture_lock );
}
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 );
}

void vout_DisplayTitle( vout_thread_t *p_vout, const char *psz_title )
{
    assert( psz_title );

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

    vlc_mutex_lock( &p_vout->change_lock );
    free( p_vout->p->psz_title );
    p_vout->p->psz_title = strdup( psz_title );
    vlc_mutex_unlock( &p_vout->change_lock );
}

spu_t *vout_GetSpu( vout_thread_t *p_vout )
{
    return p_vout->p_spu;
}

/*****************************************************************************
 * InitThread: initialize video output thread
 *****************************************************************************
 * 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.
 * XXX You have to enter it with change_lock taken.
 *****************************************************************************/
static int ChromaCreate( vout_thread_t *p_vout );
static void ChromaDestroy( vout_thread_t *p_vout );

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;

     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 )
         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;
}

static int InitThread( vout_thread_t *p_vout )
{
    int i;

    /* Initialize output method, it allocates direct buffers for us */
    if( p_vout->pf_init( p_vout ) )
        return VLC_EGENERIC;

    p_vout->p->p_picture_displayed = NULL;

    if( !I_OUTPUTPICTURES )
    {
        msg_Err( p_vout, "plugin was unable to allocate at least "
                         "one direct buffer" );
        p_vout->pf_end( p_vout );
        return VLC_EGENERIC;
    }

    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;
    }

    msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );

    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_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->output.i_aspect *
            p_vout->fmt_out.i_height;
        p_vout->fmt_out.i_sar_den = VOUT_ASPECT_FACTOR *
            p_vout->fmt_out.i_width;
    }

    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 );

    /* FIXME removed the need of both fmt_* and heap infos */
    /* Calculate shifts from system-updated masks */
    PictureHeapFixRgb( &p_vout->render );
    VideoFormatImportRgb( &p_vout->fmt_render, &p_vout->render );

    PictureHeapFixRgb( &p_vout->output );
    VideoFormatImportRgb( &p_vout->fmt_out, &p_vout->output );

    /* 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, 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,
             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, 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,
             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, 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,
             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 );

    /* Check whether we managed to create direct buffers similar to
     * the render buffers, ie same size and chroma */
    if( ( p_vout->output.i_width == p_vout->render.i_width )
     && ( p_vout->output.i_height == p_vout->render.i_height )
     && ( ChromaIsEqual( &p_vout->output, &p_vout->render ) ) )
    {
        /* 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 */