* vpar_headers.c : headers parsing
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
- * $Id: vpar_headers.c,v 1.63 2000/12/27 18:09:02 massiot Exp $
+ * $Id: vpar_headers.c,v 1.64 2000/12/29 10:52:40 massiot Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Stéphane Borel <stef@via.ecp.fr>
(p_vpar->sequence.p_forward == NULL ||
p_vpar->sequence.p_backward == NULL)));
- if( b_parsable )
+ if( p_vpar->picture.i_current_structure )
{
- if( p_vpar->picture.i_current_structure )
+ /* Second field of a frame. We will decode it if, and only if we
+ * have decoded the first field. */
+ if( b_parsable )
{
- /* Second field of a frame. We will decode it if, and only if we
- * have decoded the first field. */
b_parsable = (p_vpar->picture.p_picture != NULL);
}
- else
- {
- /* Warn synchro we have a new picture (updates pictures index). */
- vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type );
+ }
+ else
+ {
+ /* Warn synchro we have a new picture (updates pictures index). */
+ vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type );
+ if( b_parsable )
+ {
/* Does synchro say we have enough time to decode it ? */
b_parsable = vpar_SynchroChoose( p_vpar,
p_vpar->picture.i_coding_type, i_structure );
/* The frame is complete. */
p_vpar->picture.i_current_structure = i_structure;
- vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type );
vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
}
}
else
{
/* Warn Synchro we have trashed a picture. */
- vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type );
vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
}
p_vpar->picture.p_picture = NULL;
* vpar_synchro.c : frame dropping routines
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
- * $Id: vpar_synchro.c,v 1.66 2000/12/27 18:35:45 massiot Exp $
+ * $Id: vpar_synchro.c,v 1.67 2000/12/29 10:52:40 massiot Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Samuel Hocevar <sam@via.ecp.fr>
* Please bear in mind that B's and IP's will be inverted when displaying
* (decoding order != presentation order). Thus, t1 < t0.
*
+ * FIXME: write a few words about stream structure changes.
+ *
* 2. Definitions
* ===========
* t[0..12] : Presentation timestamps of pictures 0..12.
*
* 3. General considerations
* ======================
- * We define to types of machines :
- * 2T > tauP : machines capable of decoding all P pictures
+ * We define three types of machines :
* 14T > tauI : machines capable of decoding all I pictures
+ * 2T > tauP : machines capable of decoding all P pictures
+ * T > tauB : machines capable of decoding all B pictures
*
* 4. Decoding of an I picture
* ========================
* before displaying :
* t0 - t > tau´I + DELTA
*
- * 4. Decoding of a P picture
+ * 5. Decoding of a P picture
* =======================
* On fast machines, we decode all P's.
* Otherwise :
* I picture, which is more important.
* t12 - t > tau´P + tau´I + DELTA
*
- * 5. Decoding of a B picture
+ * 6. Decoding of a B picture
* =======================
- * First criterion : have time to decode it.
+ * On fast machines, we decode all B's. Otherwise :
* t1 - t > tau´B + DELTA
- *
- * Second criterion : it shouldn't prevent us from displaying the forthcoming
- * P picture, which is more important.
- * t4 - t > tau´B + tau´P + DELTA
+ * Since the next displayed I or P is already decoded, we don't have to
+ * worry about it.
*
* I hope you will have a pleasant flight and do not forget your life
* jacket.
- * --Meuuh (2000-11-09)
+ * --Meuuh (2000-12-29)
*/
/*****************************************************************************
/* Error margins */
#define DELTA (int)(0.040*CLOCK_FREQ)
+#define PTS_THRESHOLD (int)(0.030*CLOCK_FREQ)
#define DEFAULT_NB_P 5
#define DEFAULT_NB_B 1
if( (S.i_n_b + 1) * period > S.p_tau[P_CODING_TYPE] )
{
- if( period > S.p_tau[B_CODING_TYPE] )
- {
- /* Security in case we're _really_ late */
- b_decode = (pts - now > 0);
- }
- else
- {
- b_decode = (pts - now) > (TAU_PRIME(B_CODING_TYPE) + DELTA);
-
- /* next P or I */
- b_decode &= (pts - now
- + period
- * ( 2 * S.i_n_b - S.i_eta_b + 3))
- > (TAU_PRIME(B_CODING_TYPE)
- + TAU_PRIME(P_CODING_TYPE) + DELTA);
- }
+ b_decode = (pts - now) > (TAU_PRIME(B_CODING_TYPE) + DELTA);
}
else
{
*****************************************************************************/
void vpar_SynchroNewPicture( vpar_thread_t * p_vpar, int i_coding_type )
{
- /* FIXME: use decoder_fifo callback */
- pes_packet_t * p_pes;
+ pes_packet_t * p_pes;
+ mtime_t period = 1000000 / (p_vpar->sequence.i_frame_rate) * 1001;
switch( i_coding_type )
{
case I_CODING_TYPE:
- p_vpar->synchro.i_eta_p = p_vpar->synchro.i_eta_b = 0;
if( p_vpar->synchro.i_eta_p
&& p_vpar->synchro.i_eta_p != p_vpar->synchro.i_n_p )
{
p_vpar->synchro.i_n_p, p_vpar->synchro.i_eta_p );
p_vpar->synchro.i_n_p = p_vpar->synchro.i_eta_p;
}
+ p_vpar->synchro.i_eta_p = p_vpar->synchro.i_eta_b = 0;
#ifdef STATS
if( p_vpar->synchro.i_type == VPAR_SYNCHRO_DEFAULT )
{
break;
}
+ /* FIXME: use decoder_fifo callback */
p_pes = DECODER_FIFO_START( *p_vpar->bit_stream.p_decoder_fifo );
+ p_vpar->synchro.current_pts += period;
+
if( i_coding_type == B_CODING_TYPE )
{
if( p_pes->i_pts )
{
- if( p_pes->i_pts < p_vpar->synchro.current_pts )
+ if( p_pes->i_pts - p_vpar->synchro.current_pts > PTS_THRESHOLD
+ || p_vpar->synchro.current_pts - p_pes->i_pts > PTS_THRESHOLD )
{
intf_WarnMsg( 2,
- "vpar synchro warning: pts_date < current_date" );
+ "vpar synchro warning: pts != current_date (%lld)",
+ p_vpar->synchro.current_pts - p_pes->i_pts );
}
p_vpar->synchro.current_pts = p_pes->i_pts;
p_pes->i_pts = 0;
}
- else
- {
- p_vpar->synchro.current_pts += 1000000
- / (p_vpar->sequence.i_frame_rate) * 1001;
- }
}
else
{
- if( p_vpar->synchro.backward_pts == 0 )
- {
- p_vpar->synchro.current_pts += 1000000
- / (p_vpar->sequence.i_frame_rate) * 1001;
- }
- else
+ if( p_vpar->synchro.backward_pts )
{
- if( p_vpar->synchro.backward_pts < p_vpar->synchro.current_pts )
+ if( p_pes->i_dts &&
+ (p_pes->i_dts - p_vpar->synchro.backward_pts > PTS_THRESHOLD
+ || p_vpar->synchro.backward_pts - p_pes->i_dts > PTS_THRESHOLD) )
+ {
+ intf_WarnMsg( 2,
+ "vpar synchro warning: backward_pts != dts (%lld)",
+ p_vpar->synchro.backward_pts - p_pes->i_dts );
+ }
+
+ if( p_vpar->synchro.backward_pts - p_vpar->synchro.current_pts
+ > PTS_THRESHOLD
+ || p_vpar->synchro.current_pts - p_vpar->synchro.backward_pts
+ > PTS_THRESHOLD )
{
intf_WarnMsg( 2,
- "vpar warning: backward_date < current_date" );
+ "vpar synchro warning: backward_pts != current_pts (%lld)",
+ p_vpar->synchro.current_pts - p_vpar->synchro.backward_pts );
}
p_vpar->synchro.current_pts = p_vpar->synchro.backward_pts;
p_vpar->synchro.backward_pts = 0;
}
+ else if( p_pes->i_dts )
+ {
+ if( p_pes->i_dts - p_vpar->synchro.current_pts > PTS_THRESHOLD
+ || p_vpar->synchro.current_pts - p_pes->i_dts > PTS_THRESHOLD )
+ {
+ intf_WarnMsg( 2,
+ "vpar synchro warning: dts != current_pts (%lld)",
+ p_vpar->synchro.current_pts - p_pes->i_dts );
+ }
+ /* By definition of a DTS. */
+ p_vpar->synchro.current_pts = p_pes->i_dts;
+ p_pes->i_dts = 0;
+ }
if( p_pes->i_pts )
{
+ int i_n_b;
+
/* Store the PTS for the next time we have to date an I picture. */
p_vpar->synchro.backward_pts = p_pes->i_pts;
p_pes->i_pts = 0;
+
+ i_n_b = (p_vpar->synchro.backward_pts
+ - p_vpar->synchro.current_pts) / period - 1;
+ if( i_n_b != p_vpar->synchro.i_n_b )
+ {
+ intf_WarnMsg( 1,
+ "Anticipating a stream periodicity change from"
+ " B[%d] to B[%d]",
+ p_vpar->synchro.i_n_b, i_n_b );
+ p_vpar->synchro.i_n_b = i_n_b;
+ }
}
}