video_output.c 51.1 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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LGPL  
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 * Copyright (C) 2000-2007 VLC authors and VideoLAN
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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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 *          Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
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 *
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LGPL  
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 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
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 * (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 Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser 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.
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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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#include <assert.h>
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#include <vlc_vout.h>
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#include <vlc_filter.h>
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#include <vlc_vout_osd.h>
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#include <vlc_image.h>
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#include <libvlc.h>
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#include "vout_internal.h"
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#include "interlacing.h"
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#include "display.h"
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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static void *Thread(void *);
static void VoutDestructor(vlc_object_t *);
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/* Maximum delay between 2 displayed pictures.
 * XXX it is needed for now but should be removed in the long term.
 */
#define VOUT_REDISPLAY_DELAY (INT64_C(80000))
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/**
 * Late pictures having a delay higher than this value are thrashed.
 */
#define VOUT_DISPLAY_LATE_THRESHOLD (INT64_C(20000))
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/* Better be in advance when awakening than late... */
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#define VOUT_MWAIT_TOLERANCE (INT64_C(4000))
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/* */
static int VoutValidateFormat(video_format_t *dst,
                              const video_format_t *src)
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{
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    if (src->i_width <= 0  || src->i_width  > 8192 ||
        src->i_height <= 0 || src->i_height > 8192)
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        return VLC_EGENERIC;
    if (src->i_sar_num <= 0 || src->i_sar_den <= 0)
        return VLC_EGENERIC;
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    /* */
    video_format_Copy(dst, src);
    dst->i_chroma = vlc_fourcc_GetCodec(VIDEO_ES, src->i_chroma);
    vlc_ureduce( &dst->i_sar_num, &dst->i_sar_den,
                 src->i_sar_num,  src->i_sar_den, 50000 );
    if (dst->i_sar_num <= 0 || dst->i_sar_den <= 0) {
        dst->i_sar_num = 1;
        dst->i_sar_den = 1;
    }
    video_format_FixRgb(dst);
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    return VLC_SUCCESS;
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}
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static void VideoFormatCopyCropAr(video_format_t *dst,
                                  const video_format_t *src)
{
    video_format_CopyCrop(dst, src);
    dst->i_sar_num = src->i_sar_num;
    dst->i_sar_den = src->i_sar_den;
}
static bool VideoFormatIsCropArEqual(video_format_t *dst,
                                     const video_format_t *src)
{
    return dst->i_sar_num * src->i_sar_den == dst->i_sar_den * src->i_sar_num &&
           dst->i_x_offset       == src->i_x_offset &&
           dst->i_y_offset       == src->i_y_offset &&
           dst->i_visible_width  == src->i_visible_width &&
           dst->i_visible_height == src->i_visible_height;
}
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static vout_thread_t *VoutCreate(vlc_object_t *object,
                                 const vout_configuration_t *cfg)
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{
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    video_format_t original;
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    if (VoutValidateFormat(&original, cfg->fmt))
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        return NULL;

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    /* Allocate descriptor */
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    vout_thread_t *vout = vlc_custom_create(object,
                                            sizeof(*vout) + sizeof(*vout->p),
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                                            "video output");
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    if (!vout) {
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        video_format_Clean(&original);
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        return NULL;
    }

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    /* */
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    vout->p = (vout_thread_sys_t*)&vout[1];
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    vout->p->original = original;
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    vout->p->dpb_size = cfg->dpb_size;
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    vout_control_Init(&vout->p->control);
    vout_control_PushVoid(&vout->p->control, VOUT_CONTROL_INIT);
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    vout_statistic_Init(&vout->p->statistic);
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    vout_snapshot_Init(&vout->p->snapshot);
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    /* Initialize locks */
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    vlc_mutex_init(&vout->p->picture_lock);
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    vlc_mutex_init(&vout->p->filter.lock);
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    vlc_mutex_init(&vout->p->spu_lock);
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    /* Initialize subpicture unit */
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    vout->p->spu = spu_Create(vout);
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    /* Take care of some "interface/control" related initialisations */
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    vout_IntfInit(vout);
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    vout->p->title.show     = var_InheritBool(vout, "video-title-show");
    vout->p->title.timeout  = var_InheritInteger(vout, "video-title-timeout");
    vout->p->title.position = var_InheritInteger(vout, "video-title-position");
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    /* Get splitter name if present */
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    char *splitter_name = var_InheritString(vout, "video-splitter");
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    if (splitter_name && *splitter_name) {
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        vout->p->splitter_name = splitter_name;
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    } else {
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        free(splitter_name);
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    }

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    /* */
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    vout_InitInterlacingSupport(vout, vout->p->displayed.is_interlaced);
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    /* */
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    vlc_object_set_destructor(vout, VoutDestructor);
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    /* */
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    if (vlc_clone(&vout->p->thread, Thread, vout,
                  VLC_THREAD_PRIORITY_OUTPUT)) {
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        spu_Destroy(vout->p->spu);
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        vlc_object_release(vout);
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        return NULL;
    }

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    vout_control_WaitEmpty(&vout->p->control);
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    if (vout->p->dead) {
        msg_Err(vout, "video output creation failed");
        vout_CloseAndRelease(vout);
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        return NULL;
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    }
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    vout->p->input = cfg->input;
    if (vout->p->input)
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        spu_Attach(vout->p->spu, vout->p->input, true);
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    return vout;
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}

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#undef vout_Request
vout_thread_t *vout_Request(vlc_object_t *object,
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                              const vout_configuration_t *cfg)
{
    vout_thread_t *vout = cfg->vout;
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    if (cfg->change_fmt && !cfg->fmt) {
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        if (vout)
            vout_CloseAndRelease(vout);
        return NULL;
    }

    /* If a vout is provided, try reusing it */
    if (vout) {
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        if (vout->p->input != cfg->input) {
            if (vout->p->input)
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                spu_Attach(vout->p->spu, vout->p->input, false);
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            vout->p->input = cfg->input;
            if (vout->p->input)
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                spu_Attach(vout->p->spu, vout->p->input, true);
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        }
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        if (cfg->change_fmt) {
            vout_control_cmd_t cmd;
            vout_control_cmd_Init(&cmd, VOUT_CONTROL_REINIT);
            cmd.u.cfg = cfg;

            vout_control_Push(&vout->p->control, &cmd);
            vout_control_WaitEmpty(&vout->p->control);
        }
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        if (!vout->p->dead) {
            msg_Dbg(object, "reusing provided vout");
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            vout_IntfReinit(vout);
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            return vout;
        }
        vout_CloseAndRelease(vout);

        msg_Warn(object, "cannot reuse provided vout");
    }
    return VoutCreate(object, cfg);
}

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void vout_Close(vout_thread_t *vout)
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{
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    assert(vout);
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    if (vout->p->input)
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        spu_Attach(vout->p->spu, vout->p->input, false);
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    vout_snapshot_End(&vout->p->snapshot);
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    vout_control_PushVoid(&vout->p->control, VOUT_CONTROL_CLEAN);
    vlc_join(vout->p->thread, NULL);
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    vlc_mutex_lock(&vout->p->spu_lock);
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    spu_Destroy(vout->p->spu);
    vout->p->spu = NULL;
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    vlc_mutex_unlock(&vout->p->spu_lock);
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}

/* */
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static void VoutDestructor(vlc_object_t *object)
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{
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    vout_thread_t *vout = (vout_thread_t *)object;
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    /* Make sure the vout was stopped first */
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    //assert(!vout->p_module);
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    free(vout->p->splitter_name);
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    /* Destroy the locks */
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    vlc_mutex_destroy(&vout->p->spu_lock);
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    vlc_mutex_destroy(&vout->p->picture_lock);
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    vlc_mutex_destroy(&vout->p->filter.lock);
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    vout_control_Clean(&vout->p->control);
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    /* */
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    vout_statistic_Clean(&vout->p->statistic);
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    /* */
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    vout_snapshot_Clean(&vout->p->snapshot);
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    video_format_Clean(&vout->p->original);
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}

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/* */
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void vout_ChangePause(vout_thread_t *vout, bool is_paused, mtime_t date)
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{
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    vout_control_cmd_t cmd;
    vout_control_cmd_Init(&cmd, VOUT_CONTROL_PAUSE);
    cmd.u.pause.is_on = is_paused;
    cmd.u.pause.date  = date;
    vout_control_Push(&vout->p->control, &cmd);
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    vout_control_WaitEmpty(&vout->p->control);
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}
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void vout_GetResetStatistic(vout_thread_t *vout, int *displayed, int *lost)
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{
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    vout_statistic_GetReset( &vout->p->statistic, displayed, lost );
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}
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void vout_Flush(vout_thread_t *vout, mtime_t date)
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{
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    vout_control_PushTime(&vout->p->control, VOUT_CONTROL_FLUSH, date);
    vout_control_WaitEmpty(&vout->p->control);
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}
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void vout_Reset(vout_thread_t *vout)
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{
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    vout_control_PushVoid(&vout->p->control, VOUT_CONTROL_RESET);
    vout_control_WaitEmpty(&vout->p->control);
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}
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bool vout_IsEmpty(vout_thread_t *vout)
{
    vlc_mutex_lock(&vout->p->picture_lock);

    picture_t *picture = picture_fifo_Peek(vout->p->decoder_fifo);
    if (picture)
        picture_Release(picture);

    vlc_mutex_unlock(&vout->p->picture_lock);

    return !picture;
}

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void vout_FixLeaks( vout_thread_t *vout )
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{
    vlc_mutex_lock(&vout->p->picture_lock);

    picture_t *picture = picture_fifo_Peek(vout->p->decoder_fifo);
    if (!picture) {
        picture = picture_pool_Get(vout->p->decoder_pool);
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    }
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    if (picture) {
        picture_Release(picture);
        /* Not all pictures has been displayed yet or some are
         * free */
        vlc_mutex_unlock(&vout->p->picture_lock);
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        return;
    }

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    /* There is no reason that no pictures are available, force one
     * from the pool, becarefull with it though */
    msg_Err(vout, "pictures leaked, trying to workaround");
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    /* */
    picture_pool_NonEmpty(vout->p->decoder_pool, false);
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    vlc_mutex_unlock(&vout->p->picture_lock);
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}
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void vout_NextPicture(vout_thread_t *vout, mtime_t *duration)
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{
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    vout_control_cmd_t cmd;
    vout_control_cmd_Init(&cmd, VOUT_CONTROL_STEP);
    cmd.u.time_ptr = duration;
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    vout_control_Push(&vout->p->control, &cmd);
    vout_control_WaitEmpty(&vout->p->control);
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}
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void vout_DisplayTitle(vout_thread_t *vout, const char *title)
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{
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    assert(title);
    vout_control_PushString(&vout->p->control, VOUT_CONTROL_OSD_TITLE, title);
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}
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void vout_PutSubpicture( vout_thread_t *vout, subpicture_t *subpic )
{
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    vout_control_cmd_t cmd;
    vout_control_cmd_Init(&cmd, VOUT_CONTROL_SUBPICTURE);
    cmd.u.subpicture = subpic;

    vout_control_Push(&vout->p->control, &cmd);
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}
int vout_RegisterSubpictureChannel( vout_thread_t *vout )
{
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    int channel = SPU_DEFAULT_CHANNEL;

    vlc_mutex_lock(&vout->p->spu_lock);
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    if (vout->p->spu)
        channel = spu_RegisterChannel(vout->p->spu);
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    vlc_mutex_unlock(&vout->p->spu_lock);

    return channel;
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}
void vout_FlushSubpictureChannel( vout_thread_t *vout, int channel )
{
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    vout_control_PushInteger(&vout->p->control, VOUT_CONTROL_FLUSH_SUBPICTURE,
                             channel);
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}

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/**
 * It retreives a picture from the vout or NULL if no pictures are
 * available yet.
 *
 * You MUST call vout_PutPicture or vout_ReleasePicture on it.
 *
 * You may use vout_HoldPicture(paired with vout_ReleasePicture) to keep a
 * read-only reference.
 */
picture_t *vout_GetPicture(vout_thread_t *vout)
{
    /* Get lock */
    vlc_mutex_lock(&vout->p->picture_lock);
    picture_t *picture = picture_pool_Get(vout->p->decoder_pool);
    if (picture) {
        picture_Reset(picture);
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        VideoFormatCopyCropAr(&picture->format, &vout->p->original);
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    }
    vlc_mutex_unlock(&vout->p->picture_lock);

    return picture;
}

/**
 * It gives to the vout a picture to be displayed.
 *
 * The given picture MUST comes from vout_GetPicture.
 *
 * Becareful, after vout_PutPicture is called, picture_t::p_next cannot be
 * read/used.
 */
void vout_PutPicture(vout_thread_t *vout, picture_t *picture)
{
    vlc_mutex_lock(&vout->p->picture_lock);

    picture->p_next = NULL;
    picture_fifo_Push(vout->p->decoder_fifo, picture);

    vlc_mutex_unlock(&vout->p->picture_lock);

    vout_control_Wake(&vout->p->control);
}

/**
 * It releases a picture retreived by vout_GetPicture.
 */
void vout_ReleasePicture(vout_thread_t *vout, picture_t *picture)
{
    vlc_mutex_lock(&vout->p->picture_lock);

    picture_Release(picture);

    vlc_mutex_unlock(&vout->p->picture_lock);

    vout_control_Wake(&vout->p->control);
}

/**
 * It increment the reference counter of a picture retreived by
 * vout_GetPicture.
 */
void vout_HoldPicture(vout_thread_t *vout, picture_t *picture)
{
    vlc_mutex_lock(&vout->p->picture_lock);

    picture_Hold(picture);

    vlc_mutex_unlock(&vout->p->picture_lock);
}

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/* */
int vout_GetSnapshot(vout_thread_t *vout,
                     block_t **image_dst, picture_t **picture_dst,
                     video_format_t *fmt,
                     const char *type, mtime_t timeout)
{
    picture_t *picture = vout_snapshot_Get(&vout->p->snapshot, timeout);
    if (!picture) {
        msg_Err(vout, "Failed to grab a snapshot");
        return VLC_EGENERIC;
    }

    if (image_dst) {
        vlc_fourcc_t codec = VLC_CODEC_PNG;
        if (type && image_Type2Fourcc(type))
            codec = image_Type2Fourcc(type);

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        const int override_width  = var_InheritInteger(vout, "snapshot-width");
        const int override_height = var_InheritInteger(vout, "snapshot-height");
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        if (picture_Export(VLC_OBJECT(vout), image_dst, fmt,
                           picture, codec, override_width, override_height)) {
            msg_Err(vout, "Failed to convert image for snapshot");
            picture_Release(picture);
            return VLC_EGENERIC;
        }
    }
    if (picture_dst)
        *picture_dst = picture;
    else
        picture_Release(picture);
    return VLC_SUCCESS;
}

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void vout_ChangeAspectRatio( vout_thread_t *p_vout,
                             unsigned int i_num, unsigned int i_den )
{
    vout_ControlChangeSampleAspectRatio( p_vout, i_num, i_den );
}

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/* vout_Control* are usable by anyone at anytime */
void vout_ControlChangeFullscreen(vout_thread_t *vout, bool fullscreen)
{
    vout_control_PushBool(&vout->p->control, VOUT_CONTROL_FULLSCREEN,
                          fullscreen);
}
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void vout_ControlChangeWindowState(vout_thread_t *vout, unsigned st)
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{
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    vout_control_PushInteger(&vout->p->control, VOUT_CONTROL_WINDOW_STATE, st);
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}
void vout_ControlChangeDisplayFilled(vout_thread_t *vout, bool is_filled)
{
    vout_control_PushBool(&vout->p->control, VOUT_CONTROL_DISPLAY_FILLED,
                          is_filled);
}
void vout_ControlChangeZoom(vout_thread_t *vout, int num, int den)
{
    vout_control_PushPair(&vout->p->control, VOUT_CONTROL_ZOOM,
                          num, den);
}
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void vout_ControlChangeSampleAspectRatio(vout_thread_t *vout,
                                         unsigned num, unsigned den)
{
    vout_control_PushPair(&vout->p->control, VOUT_CONTROL_ASPECT_RATIO,
                          num, den);
}
void vout_ControlChangeCropRatio(vout_thread_t *vout,
                                 unsigned num, unsigned den)
{
    vout_control_PushPair(&vout->p->control, VOUT_CONTROL_CROP_RATIO,
                          num, den);
}
void vout_ControlChangeCropWindow(vout_thread_t *vout,
                                  int x, int y, int width, int height)
{
    vout_control_cmd_t cmd;
    vout_control_cmd_Init(&cmd, VOUT_CONTROL_CROP_WINDOW);
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    cmd.u.window.x      = __MAX(x, 0);
    cmd.u.window.y      = __MAX(y, 0);
    cmd.u.window.width  = __MAX(width, 0);
    cmd.u.window.height = __MAX(height, 0);
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    vout_control_Push(&vout->p->control, &cmd);
}
void vout_ControlChangeCropBorder(vout_thread_t *vout,
                                  int left, int top, int right, int bottom)
{
    vout_control_cmd_t cmd;
    vout_control_cmd_Init(&cmd, VOUT_CONTROL_CROP_BORDER);
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    cmd.u.border.left   = __MAX(left, 0);
    cmd.u.border.top    = __MAX(top, 0);
    cmd.u.border.right  = __MAX(right, 0);
    cmd.u.border.bottom = __MAX(bottom, 0);
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    vout_control_Push(&vout->p->control, &cmd);
}
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void vout_ControlChangeFilters(vout_thread_t *vout, const char *filters)
{
    vout_control_PushString(&vout->p->control, VOUT_CONTROL_CHANGE_FILTERS,
                            filters);
}
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void vout_ControlChangeSubSources(vout_thread_t *vout, const char *filters)
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{
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    vout_control_PushString(&vout->p->control, VOUT_CONTROL_CHANGE_SUB_SOURCES,
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                            filters);
}
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void vout_ControlChangeSubFilters(vout_thread_t *vout, const char *filters)
{
    vout_control_PushString(&vout->p->control, VOUT_CONTROL_CHANGE_SUB_FILTERS,
                            filters);
}
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void vout_ControlChangeSubMargin(vout_thread_t *vout, int margin)
{
    vout_control_PushInteger(&vout->p->control, VOUT_CONTROL_CHANGE_SUB_MARGIN,
                             margin);
}
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/* */
static void VoutGetDisplayCfg(vout_thread_t *vout, vout_display_cfg_t *cfg, const char *title)
{
    /* Load configuration */
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    cfg->is_fullscreen = var_CreateGetBool(vout, "fullscreen")
                         || var_InheritBool(vout, "video-wallpaper");
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    cfg->display.title = title;
    const int display_width = var_CreateGetInteger(vout, "width");
    const int display_height = var_CreateGetInteger(vout, "height");
    cfg->display.width   = display_width > 0  ? display_width  : 0;
    cfg->display.height  = display_height > 0 ? display_height : 0;
    cfg->is_display_filled  = var_CreateGetBool(vout, "autoscale");
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    unsigned msar_num, msar_den;
    if (var_InheritURational(vout, &msar_num, &msar_den, "monitor-par") ||
        msar_num <= 0 || msar_den <= 0) {
        msar_num = 1;
        msar_den = 1;
    }
    cfg->display.sar.num = msar_num;
    cfg->display.sar.den = msar_den;
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    unsigned zoom_den = 1000;
    unsigned zoom_num = zoom_den * var_CreateGetFloat(vout, "scale");
    vlc_ureduce(&zoom_num, &zoom_den, zoom_num, zoom_den, 0);
    cfg->zoom.num = zoom_num;
    cfg->zoom.den = zoom_den;
    cfg->align.vertical = VOUT_DISPLAY_ALIGN_CENTER;
    cfg->align.horizontal = VOUT_DISPLAY_ALIGN_CENTER;
    const int align_mask = var_CreateGetInteger(vout, "align");
    if (align_mask & 0x1)
        cfg->align.horizontal = VOUT_DISPLAY_ALIGN_LEFT;
    else if (align_mask & 0x2)
        cfg->align.horizontal = VOUT_DISPLAY_ALIGN_RIGHT;
    if (align_mask & 0x4)
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        cfg->align.vertical = VOUT_DISPLAY_ALIGN_TOP;
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    else if (align_mask & 0x8)
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        cfg->align.vertical = VOUT_DISPLAY_ALIGN_BOTTOM;
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}

vout_window_t * vout_NewDisplayWindow(vout_thread_t *vout, vout_display_t *vd,
                                      const vout_window_cfg_t *cfg)
{
    VLC_UNUSED(vd);
    vout_window_cfg_t cfg_override = *cfg;

    if (!var_InheritBool( vout, "embedded-video"))
        cfg_override.is_standalone = true;

    if (vout->p->window.is_unused && vout->p->window.object) {
        assert(!vout->p->splitter_name);
        if (!cfg_override.is_standalone == !vout->p->window.cfg.is_standalone &&
            cfg_override.type           == vout->p->window.cfg.type) {
            /* Reuse the stored window */
            msg_Dbg(vout, "Reusing previous vout window");
            vout_window_t *window = vout->p->window.object;
            if (cfg_override.width  != vout->p->window.cfg.width ||
                cfg_override.height != vout->p->window.cfg.height)
                vout_window_SetSize(window,
                                    cfg_override.width, cfg_override.height);
            vout->p->window.is_unused = false;
            vout->p->window.cfg       = cfg_override;
            return window;
        }

        vout_window_Delete(vout->p->window.object);
        vout->p->window.is_unused = true;
        vout->p->window.object    = NULL;
    }

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    vout_window_t *window = vout_window_New(VLC_OBJECT(vout), "$window",
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                                            &cfg_override);
    if (!window)
        return NULL;
    if (!vout->p->splitter_name) {
        vout->p->window.is_unused = false;
        vout->p->window.cfg       = cfg_override;
        vout->p->window.object    = window;
    }
    return window;
}

void vout_DeleteDisplayWindow(vout_thread_t *vout, vout_display_t *vd,
                              vout_window_t *window)
{
    VLC_UNUSED(vd);
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    if (!vout->p->window.is_unused && vout->p->window.object == window) {
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        vout->p->window.is_unused = true;
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    } else if (vout->p->window.is_unused && vout->p->window.object && !window) {
        vout_window_Delete(vout->p->window.object);
        vout->p->window.is_unused = true;
        vout->p->window.object    = NULL;
    } else if (window) {
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        vout_window_Delete(window);
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    }
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}

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/* */
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static picture_t *VoutVideoFilterInteractiveNewPicture(filter_t *filter)
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{
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    vout_thread_t *vout = filter->owner.sys;
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    picture_t *picture = picture_pool_Get(vout->p->private_pool);
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    if (picture) {
        picture_Reset(picture);
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        VideoFormatCopyCropAr(&picture->format, &filter->fmt_out.video);
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    }
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    return picture;
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}
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static picture_t *VoutVideoFilterStaticNewPicture(filter_t *filter)
{
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    vout_thread_t *vout = filter->owner.sys;
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    vlc_assert_locked(&vout->p->filter.lock);
    if (filter_chain_GetLength(vout->p->filter.chain_interactive) == 0)
        return VoutVideoFilterInteractiveNewPicture(filter);
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    return picture_NewFromFormat(&filter->fmt_out.video);
}
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static void VoutVideoFilterDelPicture(filter_t *filter, picture_t *picture)
{
    VLC_UNUSED(filter);
    picture_Release(picture);
}
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static void ThreadFilterFlush(vout_thread_t *vout, bool is_locked)
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{
    if (vout->p->displayed.current)
        picture_Release( vout->p->displayed.current );
    vout->p->displayed.current = NULL;

    if (vout->p->displayed.next)
        picture_Release( vout->p->displayed.next );
    vout->p->displayed.next = NULL;

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    if (!is_locked)
        vlc_mutex_lock(&vout->p->filter.lock);
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    filter_chain_VideoFlush(vout->p->filter.chain_static);
    filter_chain_VideoFlush(vout->p->filter.chain_interactive);
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    if (!is_locked)
        vlc_mutex_unlock(&vout->p->filter.lock);
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}

typedef struct {
    char           *name;
    config_chain_t *cfg;
} vout_filter_t;

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static void ThreadChangeFilters(vout_thread_t *vout,
                                const video_format_t *source,
                                const char *filters,
                                bool is_locked)
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{
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    ThreadFilterFlush(vout, is_locked);
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    vlc_array_t array_static;
    vlc_array_t array_interactive;

    vlc_array_init(&array_static);
    vlc_array_init(&array_interactive);
    char *current = filters ? strdup(filters) : NULL;
    while (current) {
        config_chain_t *cfg;
        char *name;
        char *next = config_ChainCreate(&name, &cfg, current);

        if (name && *name) {
            vout_filter_t *e = xmalloc(sizeof(*e));
            e->name = name;
            e->cfg  = cfg;
            if (!strcmp(e->name, "deinterlace") ||
                !strcmp(e->name, "postproc")) {
                vlc_array_append(&array_static, e);
            } else {
                vlc_array_append(&array_interactive, e);
            }
        } else {
            if (cfg)
                config_ChainDestroy(cfg);
            free(name);
        }
        free(current);
        current = next;
    }

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    if (!is_locked)
        vlc_mutex_lock(&vout->p->filter.lock);

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    es_format_t fmt_target;
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    es_format_InitFromVideo(&fmt_target, source ? source : &vout->p->filter.format);
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    es_format_t fmt_current = fmt_target;

    for (int a = 0; a < 2; a++) {
        vlc_array_t    *array = a == 0 ? &array_static :
                                         &array_interactive;
        filter_chain_t *chain = a == 0 ? vout->p->filter.chain_static :
                                         vout->p->filter.chain_interactive;

        filter_chain_Reset(chain, &fmt_current, &fmt_current);
        for (int i = 0; i < vlc_array_count(array); i++) {
            vout_filter_t *e = vlc_array_item_at_index(array, i);
            msg_Dbg(vout, "Adding '%s' as %s", e->name, a == 0 ? "static" : "interactive");
            if (!filter_chain_AppendFilter(chain, e->name, e->cfg, NULL, NULL)) {
                msg_Err(vout, "Failed to add filter '%s'", e->name);
                config_ChainDestroy(e->cfg);
            }
            free(e->name);
            free(e);
        }
        fmt_current = *filter_chain_GetFmtOut(chain);
        vlc_array_clear(array);
    }
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    if (!es_format_IsSimilar(&fmt_current, &fmt_target)) {
        msg_Dbg(vout, "Adding a filter to compensate for format changes");
        if (!filter_chain_AppendFilter(vout->p->filter.chain_interactive, NULL, NULL,
                                       &fmt_current, &fmt_target)) {
            msg_Err(vout, "Failed to compensate for the format changes, removing all filters");
            filter_chain_Reset(vout->p->filter.chain_static,      &fmt_target, &fmt_target);
            filter_chain_Reset(vout->p->filter.chain_interactive, &fmt_target, &fmt_target);
        }
    }

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    es_format_Clean(&fmt_target);

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    if (vout->p->filter.configuration != filters) {
        free(vout->p->filter.configuration);
        vout->p->filter.configuration = filters ? strdup(filters) : NULL;
    }
    if (source) {
        video_format_Clean(&vout->p->filter.format);
        video_format_Copy(&vout->p->filter.format, source);
    }

    if (!is_locked)
        vlc_mutex_unlock(&vout->p->filter.lock);
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}

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/* */
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static int ThreadDisplayPreparePicture(vout_thread_t *vout, bool reuse, bool frame_by_frame)
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{
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    bool is_late_dropped = vout->p->is_late_dropped && !vout->p->pause.is_on && !frame_by_frame;
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    vlc_mutex_lock(&vout->p->filter.lock);
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    picture_t *picture = filter_chain_VideoFilter(vout->p->filter.chain_static, NULL);
    assert(!reuse || !picture);
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    while (!picture) {
        picture_t *decoded;
        if (reuse && vout->p->displayed.decoded) {
            decoded = picture_Hold(vout->p->displayed.decoded);
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        } else {
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            decoded = picture_fifo_Pop(vout->p->decoder_fifo);
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            if (decoded) {
                if (is_late_dropped && !decoded->b_force) {
                    const mtime_t predicted = mdate() + 0; /* TODO improve */
                    const mtime_t late = predicted - decoded->date;
                    if (late > VOUT_DISPLAY_LATE_THRESHOLD) {
                        msg_Warn(vout, "picture is too late to be displayed (missing %"PRId64" ms)", late/1000);
                        picture_Release(decoded);
                        vout_statistic_AddLost(&vout->p->statistic, 1);
                        continue;
                    } else if (late > 0) {
                        msg_Dbg(vout, "picture might be displayed late (missing %"PRId64" ms)", late/1000);
                    }
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                }
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                if (!VideoFormatIsCropArEqual(&decoded->format, &vout->p->filter.format))
                    ThreadChangeFilters(vout, &decoded->format, vout->p->filter.configuration, true);
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            }
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        }
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        if (!decoded)
            break;
        reuse = false;
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        if (vout->p->displayed.decoded)
            picture_Release(vout->p->displayed.decoded);

        vout->p->displayed.decoded       = picture_Hold(decoded);
        vout->p->displayed.timestamp     = decoded->date;
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        vout->p->displayed.is_interlaced = !decoded->b_progressive;
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        picture = filter_chain_VideoFilter(vout->p->filter.chain_static, decoded);
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    }

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    vlc_mutex_unlock(&vout->p->filter.lock);

    if (!picture)
        return VLC_EGENERIC;
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    assert(!vout->p->displayed.next);
    if (!vout->p->displayed.current)
        vout->p->displayed.current = picture;
    else
        vout->p->displayed.next    = picture;
    return VLC_SUCCESS;
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}

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static int ThreadDisplayRenderPicture(vout_thread_t *vout, bool is_forced)
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{
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    vout_thread_sys_t *sys = vout->p;
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    vout_display_t *vd = vout->p->display.vd;

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    picture_t *torender = picture_Hold(vout->p->displayed.current);
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    vout_chrono_Start(&vout->p->render);
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    vlc_mutex_lock(&vout->p->filter.lock);
    picture_t *filtered = filter_chain_VideoFilter(vout->p->filter.chain_interactive, torender);
    vlc_mutex_unlock(&vout->p->filter.lock);

    if (!filtered)
        return VLC_EGENERIC;

    if (filtered->date != vout->p->displayed.current->date)
        msg_Warn(vout, "Unsupported timestamp modifications done by chain_interactive");

    /*
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     * Get the subpicture to be displayed
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     */
    const bool do_snapshot = vout_snapshot_IsRequested(&vout->p->snapshot);
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    mtime_t render_subtitle_date;
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    if (vout->p->pause.is_on)
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        render_subtitle_date = vout->p->pause.date;
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    else
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        render_subtitle_date = filtered->date > 1 ? filtered->date : mdate();
    mtime_t render_osd_date = mdate(); /* FIXME wrong */

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    /*
     * Get the subpicture to be displayed
     */
    const bool do_dr_spu = !do_snapshot &&
                           vd->info.subpicture_chromas &&
                           *vd->info.subpicture_chromas != 0;
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    //FIXME: Denying do_early_spu if vd->source.orientation != ORIENT_NORMAL
    //will have the effect that snapshots miss the subpictures. We do this
    //because there is currently no way to transform subpictures to match
    //the source format.
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    const bool do_early_spu = !do_dr_spu &&
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                               vd->source.orientation == ORIENT_NORMAL &&
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                              (vd->info.is_slow ||
                               sys->display.use_dr ||
                               do_snapshot ||
                               !vout_IsDisplayFiltered(vd) ||
                               vd->fmt.i_width * vd->fmt.i_height <= vd->source.i_width * vd->source.i_height);

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    const vlc_fourcc_t *subpicture_chromas;
    video_format_t fmt_spu;
    if (do_dr_spu) {
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        vout_display_place_t place;
        vout_display_PlacePicture(&place, &vd->source, vd->cfg, false);

        fmt_spu = vd->source;
        if (fmt_spu.i_width * fmt_spu.i_height < place.width * place.height) {
            fmt_spu.i_sar_num = vd->cfg->display.sar.num;
            fmt_spu.i_sar_den = vd->cfg->display.sar.den;
            fmt_spu.i_width          =
            fmt_spu.i_visible_width  = place.width;
            fmt_spu.i_height         =
            fmt_spu.i_visible_height = place.height;
        }
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        subpicture_chromas = vd->info.subpicture_chromas;
    } else {
        if (do_early_spu) {
            fmt_spu = vd->source;
        } else {
            fmt_spu = vd->fmt;
            fmt_spu.i_sar_num = vd->cfg->display.sar.num;
            fmt_spu.i_sar_den = vd->cfg->display.sar.den;
        }
        subpicture_chromas = NULL;

        if (vout->p->spu_blend &&
            vout->p->spu_blend->fmt_out.video.i_chroma != fmt_spu.i_chroma) {
            filter_DeleteBlend(vout->p->spu_blend);
            vout->p->spu_blend = NULL;
            vout->p->spu_blend_chroma = 0;
        }
        if (!vout->p->spu_blend && vout->p->spu_blend_chroma != fmt_spu.i_chroma) {
            vout->p->spu_blend_chroma = fmt_spu.i_chroma;
            vout->p->spu_blend = filter_NewBlend(VLC_OBJECT(vout), &fmt_spu);
            if (!vout->p->spu_blend)
                msg_Err(vout, "Failed to create blending filter, OSD/Subtitles will not work");
        }
    }

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    video_format_t fmt_spu_rot;
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    video_format_ApplyRotation(&fmt_spu_rot, &fmt_spu);
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    subpicture_t *subpic = spu_Render(vout->p->spu,
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                                      subpicture_chromas, &fmt_spu_rot,
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                                      &vd->source,
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                                      render_subtitle_date, render_osd_date,
                                      do_snapshot);
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    /*
     * Perform rendering
     *
     * We have to:
     * - be sure to end up with a direct buffer.
     * - blend subtitles, and in a fast access buffer
     */
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    bool is_direct = vout->p->decoder_pool == vout->p->display_pool;
    picture_t *todisplay = filtered;
    if (do_early_spu && subpic) {
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        picture_t *blent = picture_pool_Get(vout->p->private_pool);
        if (blent) {
            VideoFormatCopyCropAr(&blent->format, &filtered->format);
            picture_Copy(blent, filtered);
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            if (vout->p->spu_blend
             && picture_BlendSubpicture(blent, vout->p->spu_blend, subpic)) {
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                picture_Release(todisplay);
                todisplay = blent;
            } else
                picture_Release(blent);
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        }
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        subpicture_Delete(subpic);
        subpic = NULL;
    }

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    assert(vout_IsDisplayFiltered(vd) == !sys->display.use_dr);
    if (sys->display.use_dr && !is_direct) {
        picture_t *direct = picture_pool_Get(vout->p->display_pool);
        if (!direct) {
            picture_Release(todisplay);
            if (subpic)
                subpicture_Delete(subpic);
            return VLC_EGENERIC;
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        }
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        /* The display uses direct rendering (no conversion), but its pool of
         * pictures is not usable by the decoder (too few, too slow or
         * subject to invalidation...). Since there are no filters, copying
         * pictures from the decoder to the output is unavoidable. */
        VideoFormatCopyCropAr(&direct->format, &todisplay->format);
        picture_Copy(direct, todisplay);
        picture_Release(todisplay);
        todisplay = direct;
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    }
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    /*
     * Take a snapshot if requested
     */
    if (do_snapshot)
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        vout_snapshot_Set(&vout->p->snapshot, &vd->source, todisplay);
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    /* Render the direct buffer */
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    vout_UpdateDisplaySourceProperties(vd, &todisplay->format);
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    if (sys->display.use_dr) {
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        vout_display_Prepare(vd, todisplay, subpic);
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    } else {
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        sys->display.filtered = vout_FilterDisplay(vd, todisplay);
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        if (sys->display.filtered) {
            if (!do_dr_spu && !do_early_spu && vout->p->spu_blend && subpic)
                picture_BlendSubpicture(sys->display.filtered, vout->p->spu_blend, subpic);
            vout_display_Prepare(vd, sys->display.filtered, do_dr_spu ? subpic : NULL);
        }
        if (!do_dr_spu && subpic)
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        {
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            subpicture_Delete(subpic);
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            subpic = NULL;
        }
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        if (!sys->display.filtered)
            return VLC_EGENERIC;
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    }
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    vout_chrono_Stop(&vout->p->render);
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#if 0
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        {
        static int i = 0;
        if (((i++)%10) == 0)
            msg_Info(vout, "render: avg %d ms var %d ms",
                     (int)(vout->p->render.avg/1000), (int)(vout->p->render.var/1000));
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        }
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#endif

    /* Wait the real date (for rendering jitter) */
#if 0
    mtime_t delay = direct->date - mdate();
    if (delay < 1000)
        msg_Warn(vout, "picture is late (%lld ms)", delay / 1000);
#endif
    if (!is_forced)
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        mwait(todisplay->date);
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    /* Display the direct buffer returned by vout_RenderPicture */
    vout->p->displayed.date = mdate();
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    vout_display_Display(vd,
                         sys->display.filtered ? sys->display.filtered
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                                                : todisplay,
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                         subpic);
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    sys->display.filtered = NULL;
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    vout_statistic_AddDisplayed(&vout->p->statistic, 1);
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    return VLC_SUCCESS;
}
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static int ThreadDisplayPicture(vout_thread_t *vout, mtime_t *deadline)
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{
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    bool frame_by_frame = !deadline;
    bool paused = vout->p->pause.is_on;
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    bool first = !vout->p->displayed.current;
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    if (first)
        if (ThreadDisplayPreparePicture(vout, true, frame_by_frame)) /* FIXME not sure it is ok */
            return VLC_EGENERIC;

    if (!paused || frame_by_frame)
        while (!vout->p->displayed.next && !ThreadDisplayPreparePicture(vout, false, frame_by_frame))
            ;
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    const mtime_t date = mdate();
    const mtime_t render_delay = vout_chrono_GetHigh(&vout->p->render) + VOUT_MWAIT_TOLERANCE;

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    bool drop_next_frame = frame_by_frame;
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    mtime_t date_next = VLC_TS_INVALID;
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    if (!paused && vout->p->displayed.next) {
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        date_next = vout->p->displayed.next->date - render_delay;
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        if (date_next /* + 0 FIXME */ <= date)
            drop_next_frame = true;
    }
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    /* FIXME/XXX we must redisplay the last decoded picture (because
     * of potential vout updated, or filters update or SPU update)
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     * For now a high update period is needed but it could be removed
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     * if and only if:
     * - vout module emits events from theselves.
     * - *and* SPU is modified to emit an event or a deadline when needed.
     *
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     * So it will be done later.
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     */