video_output.c

VLC Player Source Code

        picture_t *p_picture = NULL;
        picture_t *p_filtered_picture;
        mtime_t display_date = 0;
        picture_t *p_directbuffer;
        input_thread_t *p_input;
        int i_index;

#if 0
        p_vout->c_loops++;
        if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
        {
            msg_Dbg( p_vout, "picture heap: %d/%d",
                     I_RENDERPICTURES, p_vout->i_heap_size );
        }
#endif

        /* Update statistics */
        p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
        if( p_input )
        {
            vlc_mutex_lock( &p_input->p->counters.counters_lock );
            stats_UpdateInteger( p_vout, p_input->p->counters.p_lost_pictures,
                                 i_lost , NULL);
            stats_UpdateInteger( p_vout,
                                 p_input->p->counters.p_displayed_pictures,
                                 i_displayed , NULL);
            i_displayed = i_lost = 0;
            vlc_mutex_unlock( &p_input->p->counters.counters_lock );
            vlc_object_release( p_input );
        }

        /*
         * Find the picture to display (the one with the earliest date).
         * This operation does not need lock, since only READY_PICTUREs
         * are handled. */
        for( 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_picture == NULL || p_pic->date < display_date ) )
            {
                p_picture = p_pic;
                display_date = p_picture->date;
            }
        }

        if( p_picture )
        {
            /* If we met the last picture, parse again to see whether there is
             * a more appropriate one. */
            if( p_picture == p_last_picture )
            {
                for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
                {
                    picture_t *p_pic = PP_RENDERPICTURE[i_index];

                    if( p_pic->i_status == READY_PICTURE &&
                        p_pic != p_last_picture &&
                        ( p_picture == p_last_picture || p_pic->date < display_date ) )
                    {
                        p_picture = p_pic;
                        display_date = p_picture->date;
                    }
                }
            }

            /* If we found better than the last picture, destroy it */
            if( p_last_picture && p_picture != p_last_picture )
            {
                DropPicture( p_vout, p_last_picture );
                p_last_picture = NULL;
            }

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

            if( !p_picture->b_force &&
                p_picture != p_last_picture &&
                display_date < current_date + p_vout->render_time &&
                b_drop_late )
            {
                /* Picture is late: it will be destroyed and the thread
                 * will directly choose the next picture */
                DropPicture( p_vout, p_picture );
                i_lost++;
                msg_Warn( p_vout, "late picture skipped (%"PRId64")",
                                  current_date - display_date );
                continue;
            }

            if( display_date >
                current_date + p_vout->i_pts_delay + VOUT_BOGUS_DELAY )
            {
                /* Picture is waaay too early: it will be destroyed */
                DropPicture( p_vout, p_picture );
                i_lost++;
                msg_Warn( p_vout, "vout warning: early picture skipped "
                          "(%"PRId64")", display_date - current_date
                          - p_vout->i_pts_delay );
                continue;
            }

            if( display_date > current_date + VOUT_DISPLAY_DELAY )
            {
                /* A picture is ready to be rendered, but its rendering date
                 * is far from the current one so the thread will perform an
                 * empty loop as if no picture were found. The picture state
                 * is unchanged */
                p_picture    = NULL;
                display_date = 0;
            }
            else if( p_picture == p_last_picture )
            {
                /* We are asked to repeat the previous picture, but we first
                 * wait for a couple of idle loops */
                if( i_idle_loops < 4 )
                {
                    p_picture    = NULL;
                    display_date = 0;
                }
                else
                {
                    /* We set the display date to something high, otherwise
                     * we'll have lots of problems with late pictures */
                    display_date = current_date + p_vout->render_time;
                }
            }
        }

        if( p_picture == NULL )
            i_idle_loops++;

        p_filtered_picture = NULL;
        if( p_picture )
            p_filtered_picture = filter_chain_VideoFilter( p_vout->p_vf2_chain,
                                                           p_picture );

        if( p_filtered_picture && p_vout->b_snapshot )
        {
            p_vout->b_snapshot = false;
            vout_Snapshot( p_vout, p_filtered_picture );
        }

        /*
         * Check for subpictures to display
         */
        if( display_date > 0 )
        {
            p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
            p_subpic = spu_SortSubpictures( p_vout->p_spu, display_date,
                                            p_input ? var_GetBool( p_input, "state" ) == PAUSE_S : false );
            if( p_input )
                vlc_object_release( p_input );
        }

        /*
         * Perform rendering
         */
        i_displayed++;
        p_directbuffer = vout_RenderPicture( p_vout, p_filtered_picture, p_subpic );

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

        /*
         * Sleep, wake up
         */
        if( display_date != 0 && p_directbuffer != NULL )
        {
            mtime_t current_render_time = mdate() - current_date;
            /* if render time is very large we don't include it in the mean */
            if( current_render_time < p_vout->render_time +
                VOUT_DISPLAY_DELAY )
            {
                /* Store render time using a sliding mean weighting to
                 * current value in a 3 to 1 ratio*/
                p_vout->render_time *= 3;
                p_vout->render_time += current_render_time;
                p_vout->render_time >>= 2;
            }
        }

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

        vlc_object_unlock( p_vout );

        /* Sleep a while or until a given date */
        if( display_date != 0 )
        {
            /* If there are filters in the chain, better give them the picture
             * in advance */
            if( !p_vout->psz_filter_chain || !*p_vout->psz_filter_chain )
            {
                mwait( display_date - VOUT_MWAIT_TOLERANCE );
            }
        }
        else
        {
            msleep( VOUT_IDLE_SLEEP );
        }

        /* On awakening, take back lock and send immediately picture
         * to display. */
        vlc_object_lock( p_vout );
        /* Note: vlc_object_alive() could be false here, and we
         * could be dead */
        vlc_mutex_lock( &p_vout->change_lock );

        /*
         * Display the previously rendered picture
         */
        if( p_filtered_picture != NULL && p_directbuffer != NULL )
        {
            /* Display the direct buffer returned by vout_RenderPicture */
            if( p_vout->pf_display )
                p_vout->pf_display( p_vout, p_directbuffer );

            /* Tell the vout this was the last picture and that it does not
             * need to be forced anymore. */
            p_last_picture = p_picture;
            p_last_picture->b_force = false;
        }

        /* Drop the filtered picture if created by video filters */
        if( p_filtered_picture != NULL && p_filtered_picture != p_picture )
            DropPicture( p_vout, p_filtered_picture );

        if( p_picture != NULL )
        {
            /* Reinitialize idle loop count */
            i_idle_loops = 0;
        }

        /*
         * Check events and manage thread
         */
        if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
        {
            /* A fatal error occurred, and the thread must terminate
             * immediately, without displaying anything - setting b_error to 1
             * causes the immediate end of the main while() loop. */
            // FIXME pf_end
            p_vout->b_error = 1;
            break;
        }

        if( p_vout->i_changes & VOUT_SIZE_CHANGE )
        {
            /* this must only happen when the vout plugin is incapable of
             * rescaling the picture itself. In this case we need to destroy
             * the current picture buffers and recreate new ones with the right
             * dimensions */
            int i;

            p_vout->i_changes &= ~VOUT_SIZE_CHANGE;

            assert( !p_vout->b_direct );

            ChromaDestroy( p_vout );

            vlc_mutex_lock( &p_vout->picture_lock );

            p_vout->pf_end( p_vout );

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

            I_OUTPUTPICTURES = 0;

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

            vlc_mutex_unlock( &p_vout->picture_lock );

            /* Need to reinitialise the chroma plugin. Since we might need
             * resizing too and it's not sure that we already had it,
             * recreate the chroma plugin chain from scratch. */
            /* dionoea */
            if( ChromaCreate( p_vout ) )
            {
                msg_Err( p_vout, "WOW THIS SUCKS BIG TIME!!!!!" );
                p_vout->b_error = 1;
            }
            if( p_vout->b_error )
                break;
        }

        if( p_vout->i_changes & VOUT_PICTURE_BUFFERS_CHANGE )
        {
            /* This happens when the picture buffers need to be recreated.
             * This is useful on multimonitor displays for instance.
             *
             * Warning: This only works when the vout creates only 1 picture
             * buffer!! */
            p_vout->i_changes &= ~VOUT_PICTURE_BUFFERS_CHANGE;

            if( !p_vout->b_direct )
                ChromaDestroy( p_vout );

            vlc_mutex_lock( &p_vout->picture_lock );

            p_vout->pf_end( p_vout );

            I_OUTPUTPICTURES = I_RENDERPICTURES = 0;

            p_vout->b_error = InitThread( p_vout );
            if( p_vout->b_error )
                msg_Err( p_vout, "InitThread after VOUT_PICTURE_BUFFERS_CHANGE failed\n" );

            vlc_mutex_unlock( &p_vout->picture_lock );

            if( p_vout->b_error )
                break;
        }

        /* Check for "video filter2" changes */
        vlc_mutex_lock( &p_vout->vfilter_lock );
        if( p_vout->psz_vf2 )
        {
            es_format_t fmt;

            es_format_Init( &fmt, VIDEO_ES, p_vout->fmt_render.i_chroma );
            fmt.video = p_vout->fmt_render;
            filter_chain_Reset( p_vout->p_vf2_chain, &fmt, &fmt );

            if( filter_chain_AppendFromString( p_vout->p_vf2_chain,
                                               p_vout->psz_vf2 ) < 0 )
                msg_Err( p_vout, "Video filter chain creation failed" );

            free( p_vout->psz_vf2 );
            p_vout->psz_vf2 = NULL;
        }
        vlc_mutex_unlock( &p_vout->vfilter_lock );
    }

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

    /* End of thread */
    CleanThread( p_vout );
    EndThread( p_vout );
    vlc_mutex_unlock( &p_vout->change_lock );

    vlc_object_unlock( p_vout );
    return NULL;
}

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

/*****************************************************************************
 * CleanThread: clean up after InitThread
 *****************************************************************************
 * This function is called after a sucessful
 * initialization. It frees all resources allocated by InitThread.
 * XXX You have to enter it with change_lock taken.
 *****************************************************************************/
static void CleanThread( vout_thread_t *p_vout )
{
    int     i_index;                                        /* index in heap */

    if( !p_vout->b_direct )
        ChromaDestroy( p_vout );

    /* Destroy all remaining pictures */
    for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES + 1; i_index++ )
    {
        if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
        {
            free( p_vout->p_picture[i_index].p_data_orig );
        }
    }

    /* Destroy translation tables */
    if( !p_vout->b_error )
        p_vout->pf_end( p_vout );
}

/*****************************************************************************
 * EndThread: thread destruction
 *****************************************************************************
 * This function is called when the thread ends.
 * It frees all resources not allocated by InitThread.
 * XXX You have to enter it with change_lock taken.