vout_synchro.c

video linux conference

        if( p_synchro->i_nb_ref < 2 )
        {
            b_decode = 0;
        }
        else if( (S.i_n_b + 1) * period > S.p_tau[P_CODING_TYPE] )
        {
            b_decode = (pts - now) > (TAU_PRIME(B_CODING_TYPE) + DELTA);
        }
        else
        {
            b_decode = 0;
        }
    }

    if( !b_decode )
    {
        S.i_not_chosen_pic++;
    }
    return( b_decode );
#undef S
#undef TAU_PRIME
}

/*****************************************************************************
 * vout_SynchroTrash : Update counters when we trash a picture
 *****************************************************************************/
void vout_SynchroTrash( vout_synchro_t * p_synchro )
{
    p_synchro->i_trashed_pic++;
    p_synchro->i_nb_ref = p_synchro->i_trash_nb_ref;
}

/*****************************************************************************
 * vout_SynchroDecode : Update timers when we decide to decode a picture
 *****************************************************************************/
void vout_SynchroDecode( vout_synchro_t * p_synchro )
{
    p_synchro->decoding_start = mdate();
    p_synchro->i_nb_ref = p_synchro->i_dec_nb_ref;
}

/*****************************************************************************
 * vout_SynchroEnd : Called when the image is totally decoded
 *****************************************************************************/
void vout_SynchroEnd( vout_synchro_t * p_synchro, int i_coding_type,
                      vlc_bool_t b_garbage )
{
    mtime_t     tau;

    if( !b_garbage )
    {
        tau = mdate() - p_synchro->decoding_start;

        /* If duration too high, something happened (pause ?), so don't
         * take it into account. */
        if( tau < 3 * p_synchro->p_tau[i_coding_type]
             || ( !p_synchro->pi_meaningful[i_coding_type]
                   && tau < MAX_VALID_TAU ) )
        {
            /* Mean with average tau, to ensure stability. */
            p_synchro->p_tau[i_coding_type] =
                (p_synchro->pi_meaningful[i_coding_type]
                 * p_synchro->p_tau[i_coding_type] + tau)
                / (p_synchro->pi_meaningful[i_coding_type] + 1);
            if( p_synchro->pi_meaningful[i_coding_type] < MAX_PIC_AVERAGE )
            {
                p_synchro->pi_meaningful[i_coding_type]++;
            }
        }
    }
}

/*****************************************************************************
 * vout_SynchroDate : When an image has been decoded, ask for its date
 *****************************************************************************/
mtime_t vout_SynchroDate( vout_synchro_t * p_synchro )
{
    /* No need to lock, since PTS are only used by the video parser. */
    return p_synchro->current_pts;
}

/*****************************************************************************
 * vout_SynchroNewPicture: Update stream structure and PTS
 *****************************************************************************/
void vout_SynchroNewPicture( vout_synchro_t * p_synchro, int i_coding_type,
                             int i_repeat_field, mtime_t next_pts,
                             mtime_t next_dts, int i_current_rate,
                             vlc_bool_t b_low_delay )
{
    mtime_t         period = 1000000 * 1001 / p_synchro->i_frame_rate
                              * i_current_rate / INPUT_RATE_DEFAULT;
#if 0
    mtime_t         now = mdate();
#endif
    p_synchro->i_current_rate = i_current_rate;

    switch( i_coding_type )
    {
    case I_CODING_TYPE:
        if( p_synchro->i_eta_p
             && p_synchro->i_eta_p != p_synchro->i_n_p )
        {
#if 0
            if( !p_synchro->b_quiet )
                msg_Dbg( p_synchro,
                         "stream periodicity changed from P[%d] to P[%d]",
                         p_synchro->i_n_p, p_synchro->i_eta_p );
#endif
            p_synchro->i_n_p = p_synchro->i_eta_p;
        }
        p_synchro->i_eta_p = p_synchro->i_eta_b = 0;
        p_synchro->i_trash_nb_ref = 0;
        if( p_synchro->i_nb_ref < 2 )
            p_synchro->i_dec_nb_ref = p_synchro->i_nb_ref + 1;
        else
            p_synchro->i_dec_nb_ref = p_synchro->i_nb_ref;

#if 0
        if( !p_synchro->b_quiet )
            msg_Dbg( p_synchro, "I("I64Fd") P("I64Fd")[%d] B("I64Fd")"
                  "[%d] YUV("I64Fd") : trashed %d:%d/%d",
                  p_synchro->p_tau[I_CODING_TYPE],
                  p_synchro->p_tau[P_CODING_TYPE],
                  p_synchro->i_n_p,
                  p_synchro->p_tau[B_CODING_TYPE],
                  p_synchro->i_n_b,
                  p_synchro->i_render_time,
                  p_synchro->i_not_chosen_pic,
                  p_synchro->i_trashed_pic -
                  p_synchro->i_not_chosen_pic,
                  p_synchro->i_pic );
        p_synchro->i_trashed_pic = p_synchro->i_not_chosen_pic
            = p_synchro->i_pic = 0;
#else
        if( p_synchro->i_pic >= 100 )
        {
            if( !p_synchro->b_quiet && p_synchro->i_trashed_pic != 0 )
                msg_Dbg( p_synchro, "decoded %d/%d pictures",
                         p_synchro->i_pic
                           - p_synchro->i_trashed_pic,
                         p_synchro->i_pic );
            p_synchro->i_trashed_pic = p_synchro->i_not_chosen_pic
                = p_synchro->i_pic = 0;
        }
#endif
        break;

    case P_CODING_TYPE:
        p_synchro->i_eta_p++;
        if( p_synchro->i_eta_b
             && p_synchro->i_eta_b != p_synchro->i_n_b )
        {
#if 0
            if( !p_synchro->b_quiet )
                msg_Dbg( p_synchro,
                         "stream periodicity changed from B[%d] to B[%d]",
                         p_synchro->i_n_b, p_synchro->i_eta_b );
#endif
            p_synchro->i_n_b = p_synchro->i_eta_b;
        }
        p_synchro->i_eta_b = 0;
        p_synchro->i_dec_nb_ref = 2;
        p_synchro->i_trash_nb_ref = 0;
        break;

    case B_CODING_TYPE:
        p_synchro->i_eta_b++;
        p_synchro->i_dec_nb_ref = p_synchro->i_trash_nb_ref
            = p_synchro->i_nb_ref;
        break;
    }

    p_synchro->current_pts += p_synchro->i_current_period
                                        * (period >> 1);

#define PTS_THRESHOLD   (period >> 2)
    if( i_coding_type == B_CODING_TYPE || b_low_delay )
    {
        /* A video frame can be displayed 1, 2 or 3 times, according to
         * repeat_first_field, top_field_first, progressive_sequence and
         * progressive_frame. */
        p_synchro->i_current_period = i_repeat_field;

        if( next_pts )
        {
            if( (next_pts - p_synchro->current_pts
                    > PTS_THRESHOLD
                  || p_synchro->current_pts - next_pts
                    > PTS_THRESHOLD) && !p_synchro->b_quiet )
            {
                msg_Warn( p_synchro, "vout synchro warning: pts != "
                          "current_date ("I64Fd")",
                          p_synchro->current_pts
                              - next_pts );
            }
            p_synchro->current_pts = next_pts;
        }
    }
    else
    {
        p_synchro->i_current_period = p_synchro->i_backward_period;
        p_synchro->i_backward_period = i_repeat_field;

        if( p_synchro->backward_pts )
        {
            if( next_dts &&
                (next_dts - p_synchro->backward_pts
                    > PTS_THRESHOLD
                  || p_synchro->backward_pts - next_dts
                    > PTS_THRESHOLD) && !p_synchro->b_quiet )
            {
                msg_Warn( p_synchro, "backward_pts != dts ("I64Fd")",
                           next_dts
                               - p_synchro->backward_pts );
            }
            if( (p_synchro->backward_pts - p_synchro->current_pts
                    > PTS_THRESHOLD
                  || p_synchro->current_pts - p_synchro->backward_pts
                    > PTS_THRESHOLD) && !p_synchro->b_quiet )
            {
                msg_Warn( p_synchro,
                          "backward_pts != current_pts ("I64Fd")",
                          p_synchro->current_pts
                              - p_synchro->backward_pts );
            }
            p_synchro->current_pts = p_synchro->backward_pts;
            p_synchro->backward_pts = 0;
        }
        else if( next_dts )
        {
            if( (next_dts - p_synchro->current_pts
                    > PTS_THRESHOLD
                  || p_synchro->current_pts - next_dts
                    > PTS_THRESHOLD) && !p_synchro->b_quiet )
            {
                msg_Warn( p_synchro, "dts != current_pts ("I64Fd")",
                          p_synchro->current_pts
                              - next_dts );
            }
            /* By definition of a DTS. */
            p_synchro->current_pts = next_dts;
            next_dts = 0;
        }

        if( next_pts )
        {
            /* Store the PTS for the next time we have to date an I picture. */
            p_synchro->backward_pts = next_pts;
            next_pts = 0;
        }
    }
#undef PTS_THRESHOLD

#if 0
    /* Removed for incompatibility with slow motion */
    if( p_synchro->current_pts + DEFAULT_PTS_DELAY < now )
    {
        /* We cannot be _that_ late, something must have happened, reinit
         * the dates. */
        if( !p_synchro->b_quiet )
            msg_Warn( p_synchro, "PTS << now ("I64Fd"), resetting",
                      now - p_synchro->current_pts - DEFAULT_PTS_DELAY );
        p_synchro->current_pts = now + DEFAULT_PTS_DELAY;
    }
    if( p_synchro->backward_pts
         && p_synchro->backward_pts + DEFAULT_PTS_DELAY < now )
    {
        /* The same. */
        p_synchro->backward_pts = 0;
    }
#endif

    p_synchro->i_pic++;
}