/*****************************************************************************
- * vpar_motion.c : motion vectors parsing
- * (c)1999 VideoLAN
+ * vpar_synchro.c : frame dropping routines
+ *****************************************************************************
+ * Copyright (C) 1999, 2000 VideoLAN
+ * $Id: vpar_synchro.c,v 1.78 2001/01/18 05:13:23 sam Exp $
+ *
+ * Authors: Christophe Massiot <massiot@via.ecp.fr>
+ * Samuel Hocevar <sam@via.ecp.fr>
+ * Jean-Marc Dressler <polux@via.ecp.fr>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
+/*
+ * DISCUSSION : How to Write an efficient Frame-Dropping Algorithm
+ * ==========
+ *
+ * This implementation is based on mathematical and statistical
+ * developments. Older implementations used an enslavement, considering
+ * that if we're late when reading an I picture, we will decode one frame
+ * less. It had a tendancy to derive, and wasn't responsive enough, which
+ * would have caused trouble with the stream control stuff.
+ *
+ * 1. Structure of a picture stream
+ * =============================
+ * Between 2 I's, we have for instance :
+ * I B P B P B P B P B P B I
+ * t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12
+ * 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.
+ * t : Current timestamp, at the moment of the decoding.
+ * T : Picture period, T = 1/frame_rate.
+ * tau[I,P,B] : Mean time to decode an [I,P,B] picture.
+ * tauYUV : Mean time to render a picture (given by the video_output).
+ * tau´[I,P,B] = 2 * tau[I,P,B] + tauYUV
+ * : Mean time + typical difference (estimated to tau/2, that
+ * needs to be confirmed) + render time.
+ * DELTA : A given error margin.
+ *
+ * 3. General considerations
+ * ======================
+ * 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
+ * ========================
+ * On fast machines, we decode all I's.
+ * Otherwise :
+ * We can decode an I picture if we simply have enough time to decode it
+ * before displaying :
+ * t0 - t > tau´I + DELTA
+ *
+ * 5. Decoding of a P picture
+ * =======================
+ * On fast machines, we decode all P's.
+ * Otherwise :
+ * First criterion : have time to decode it.
+ * t2 - t > tau´P + DELTA
+ *
+ * Second criterion : it shouldn't prevent us from displaying the forthcoming
+ * I picture, which is more important.
+ * t12 - t > tau´P + tau´I + DELTA
+ *
+ * 6. Decoding of a B picture
+ * =======================
+ * On fast machines, we decode all B's. Otherwise :
+ * t1 - t > tau´B + 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 (2000-12-29)
+ */
+
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include <errno.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/uio.h>
-#include <X11/Xlib.h>
-#include <X11/extensions/XShm.h>
+#include "defs.h"
#include "config.h"
#include "common.h"
+#include "threads.h"
#include "mtime.h"
-#include "vlc_thread.h"
+#include "plugins.h"
#include "intf_msg.h"
-#include "debug.h" /* ?? temporaire, requis par netlist.h */
-#include "input.h"
-#include "input_netlist.h"
-#include "decoder_fifo.h"
+#include "stream_control.h"
+#include "input_ext-dec.h"
+
#include "video.h"
#include "video_output.h"
-#include "vdec_idct.h"
#include "video_decoder.h"
#include "vdec_motion.h"
+#include "../video_decoder/vdec_idct.h"
#include "vpar_blocks.h"
-#include "vpar_headers.h"
-#include "video_fifo.h"
-#include "vpar_synchro.h"
-#include "video_parser.h"
+#include "../video_decoder/vpar_headers.h"
+#include "../video_decoder/vpar_synchro.h"
+#include "../video_decoder/video_parser.h"
+
+#include "main.h"
/*
* Local prototypes
*/
+static int SynchroType( void );
+
+/* Error margins */
+#define DELTA (int)(0.040*CLOCK_FREQ)
+
+#define DEFAULT_NB_P 5
+#define DEFAULT_NB_B 1
+
+/*****************************************************************************
+ * vpar_SynchroInit : You know what ?
+ *****************************************************************************/
+void vpar_SynchroInit( vpar_thread_t * p_vpar )
+{
+ p_vpar->synchro.i_type = SynchroType();
+ p_vpar->synchro.i_start = p_vpar->synchro.i_end = 0;
+ vlc_mutex_init( &p_vpar->synchro.fifo_lock );
+
+ /* We use a fake stream pattern, which is often right. */
+ p_vpar->synchro.i_n_p = p_vpar->synchro.i_eta_p = DEFAULT_NB_P;
+ p_vpar->synchro.i_n_b = p_vpar->synchro.i_eta_b = DEFAULT_NB_B;
+ memset( p_vpar->synchro.p_tau, 0, 4 * sizeof(mtime_t) );
+ memset( p_vpar->synchro.pi_meaningful, 0, 4 * sizeof(unsigned int) );
+ p_vpar->synchro.b_dropped_last = 0;
+ p_vpar->synchro.current_pts = mdate() + DEFAULT_PTS_DELAY;
+ p_vpar->synchro.backward_pts = 0;
+ p_vpar->synchro.i_current_period = p_vpar->synchro.i_backward_period = 0;
+#ifdef STATS
+ p_vpar->synchro.i_trashed_pic = p_vpar->synchro.i_not_chosen_pic =
+ p_vpar->synchro.i_pic = 0;
+#endif
+}
/*****************************************************************************
* vpar_SynchroChoose : Decide whether we will decode a picture or not
boolean_t vpar_SynchroChoose( vpar_thread_t * p_vpar, int i_coding_type,
int i_structure )
{
- return( 1 );
- return( i_coding_type == I_CODING_TYPE || i_coding_type == P_CODING_TYPE );
- //return( i_coding_type == I_CODING_TYPE );
+ /* For clarity reasons, we separated the special synchros code from the
+ * mathematical synchro */
+
+ if( p_vpar->synchro.i_type != VPAR_SYNCHRO_DEFAULT )
+ {
+ switch( i_coding_type )
+ {
+ case I_CODING_TYPE:
+ /* I, IP, IP+, IPB */
+ if( p_vpar->synchro.i_type == VPAR_SYNCHRO_Iplus )
+ {
+ p_vpar->synchro.b_dropped_last = 1;
+ }
+ return( 1 );
+
+ case P_CODING_TYPE:
+ if( p_vpar->synchro.i_type == VPAR_SYNCHRO_I ) /* I */
+ {
+ return( 0 );
+ }
+
+ if( p_vpar->synchro.i_type == VPAR_SYNCHRO_Iplus ) /* I+ */
+ {
+ if( p_vpar->synchro.b_dropped_last )
+ {
+ p_vpar->synchro.b_dropped_last = 0;
+ return( 1 );
+ }
+ else
+ {
+ return( 0 );
+ }
+ }
+
+ return( 1 ); /* IP, IP+, IPB */
+
+ case B_CODING_TYPE:
+ if( p_vpar->synchro.i_type <= VPAR_SYNCHRO_IP ) /* I, IP */
+ {
+ return( 0 );
+ }
+ else if( p_vpar->synchro.i_type == VPAR_SYNCHRO_IPB ) /* IPB */
+ {
+ return( 1 );
+ }
+
+ p_vpar->synchro.b_dropped_last ^= 1; /* IP+ */
+ return( !p_vpar->synchro.b_dropped_last );
+ }
+ return( 0 ); /* never reached but gcc yells at me */
+ }
+ else
+ {
+#define TAU_PRIME( coding_type ) (p_vpar->synchro.p_tau[(coding_type)] \
+ + (p_vpar->synchro.p_tau[(coding_type)] >> 1) \
+ + tau_yuv)
+#define S p_vpar->synchro
+ /* VPAR_SYNCHRO_DEFAULT */
+ mtime_t now, pts, period, tau_yuv;
+ boolean_t b_decode = 0;
+#ifdef DEBUG_VPAR
+ char p_date[MSTRTIME_MAX_SIZE];
+#endif
+
+ now = mdate();
+ period = 1000000 * 1001 / p_vpar->sequence.i_frame_rate;
+
+ vlc_mutex_lock( &p_vpar->p_vout->change_lock );
+ tau_yuv = p_vpar->p_vout->render_time;
+ vlc_mutex_unlock( &p_vpar->p_vout->change_lock );
+
+ vlc_mutex_lock( &p_vpar->synchro.fifo_lock );
+
+ switch( i_coding_type )
+ {
+ case I_CODING_TYPE:
+ if( S.backward_pts )
+ {
+ pts = S.backward_pts;
+ }
+ else
+ {
+ /* displaying order : B B P B B I
+ * ^ ^
+ * | +- current picture
+ * +- current PTS
+ */
+ pts = S.current_pts + period * (S.i_n_b + 2);
+ }
+
+ if( (1 + S.i_n_p * (S.i_n_b + 1)) * period >
+ S.p_tau[I_CODING_TYPE] )
+ {
+ b_decode = 1;
+ }
+ else
+ {
+ b_decode = (pts - now) > (TAU_PRIME(I_CODING_TYPE) + DELTA);
+ }
+ if( !b_decode )
+ intf_WarnMsg( 3, "vpar synchro warning: trashing I" );
+ break;
+
+ case P_CODING_TYPE:
+ if( S.backward_pts )
+ {
+ pts = S.backward_pts;
+ }
+ else
+ {
+ pts = S.current_pts + period * (S.i_n_b + 1);
+ }
+
+ if( (1 + S.i_n_p * (S.i_n_b + 1)) * period >
+ S.p_tau[I_CODING_TYPE] )
+ {
+ if( (S.i_n_b + 1) * period > S.p_tau[P_CODING_TYPE] )
+ {
+ /* Security in case we're _really_ late */
+ b_decode = (pts - now > 0);
+ }
+ else
+ {
+ b_decode = (pts - now) > (TAU_PRIME(P_CODING_TYPE) + DELTA);
+ /* next I */
+ b_decode &= (pts - now
+ + period
+ * ( (S.i_n_p - S.i_eta_p) * (1 + S.i_n_b) - 1 ))
+ > (TAU_PRIME(P_CODING_TYPE)
+ + TAU_PRIME(I_CODING_TYPE) + DELTA);
+ }
+ }
+ else
+ {
+ b_decode = 0;
+ }
+ break;
+
+ case B_CODING_TYPE:
+ pts = S.current_pts;
+
+ 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;
+ }
+ }
+
+ vlc_mutex_unlock( &p_vpar->synchro.fifo_lock );
+#ifdef DEBUG_VPAR
+ intf_DbgMsg("vpar synchro debug: %s picture scheduled for %s, %s (%lld)",
+ i_coding_type == B_CODING_TYPE ? "B" :
+ (i_coding_type == P_CODING_TYPE ? "P" : "I"),
+ mstrtime(p_date, pts), b_decode ? "decoding" : "trashed",
+ S.p_tau[i_coding_type]);
+#endif
+#ifdef STATS
+ if( !b_decode )
+ {
+ S.i_not_chosen_pic++;
+ }
+#endif
+ return( b_decode );
+#undef S
+#undef TAU_PRIME
+ }
}
/*****************************************************************************
- * vpar_SynchroTrash : Update timers when we trash a picture
+ * vpar_SynchroTrash : Update counters when we trash a picture
*****************************************************************************/
void vpar_SynchroTrash( vpar_thread_t * p_vpar, int i_coding_type,
int i_structure )
{
-
+#ifdef STATS
+ p_vpar->synchro.i_trashed_pic++;
+#endif
}
/*****************************************************************************
* vpar_SynchroDecode : Update timers when we decide to decode a picture
*****************************************************************************/
-mtime_t vpar_SynchroDecode( vpar_thread_t * p_vpar, int i_coding_type,
- int i_structure )
+void vpar_SynchroDecode( vpar_thread_t * p_vpar, int i_coding_type,
+ int i_structure )
{
- return mdate() + 500000;
+ vlc_mutex_lock( &p_vpar->synchro.fifo_lock );
+
+ if( ((p_vpar->synchro.i_end + 1 - p_vpar->synchro.i_start)
+ % MAX_DECODING_PIC) )
+ {
+ p_vpar->synchro.p_date_fifo[p_vpar->synchro.i_end] = mdate();
+ p_vpar->synchro.pi_coding_types[p_vpar->synchro.i_end] = i_coding_type;
+
+ FIFO_INCREMENT( i_end );
+ }
+ else
+ {
+ /* FIFO full, panic() */
+ intf_ErrMsg("vpar error: synchro fifo full, estimations will be biased");
+ }
+ vlc_mutex_unlock( &p_vpar->synchro.fifo_lock );
}
/*****************************************************************************
* vpar_SynchroEnd : Called when the image is totally decoded
*****************************************************************************/
-void vpar_SynchroEnd( vpar_thread_t * p_vpar )
+void vpar_SynchroEnd( vpar_thread_t * p_vpar, int i_garbage )
{
+ mtime_t tau;
+ int i_coding_type;
+
+ vlc_mutex_lock( &p_vpar->synchro.fifo_lock );
+ if (!i_garbage)
+ {
+ tau = mdate() - p_vpar->synchro.p_date_fifo[p_vpar->synchro.i_start];
+ i_coding_type = p_vpar->synchro.pi_coding_types[p_vpar->synchro.i_start];
+
+ /* Mean with average tau, to ensure stability. */
+ p_vpar->synchro.p_tau[i_coding_type] =
+ (p_vpar->synchro.pi_meaningful[i_coding_type]
+ * p_vpar->synchro.p_tau[i_coding_type] + tau)
+ / (p_vpar->synchro.pi_meaningful[i_coding_type] + 1);
+ if( p_vpar->synchro.pi_meaningful[i_coding_type] < MAX_PIC_AVERAGE )
+ {
+ p_vpar->synchro.pi_meaningful[i_coding_type]++;
+ }
+#ifdef DEBUG_VPAR
+ intf_DbgMsg("vpar synchro debug: finished decoding %s (%lld)",
+ i_coding_type == B_CODING_TYPE ? "B" :
+ (i_coding_type == P_CODING_TYPE ? "P" : "I"), tau);
+#endif
+ }
+
+ FIFO_INCREMENT( i_start );
+
+ vlc_mutex_unlock( &p_vpar->synchro.fifo_lock );
+}
+
+/*****************************************************************************
+ * vpar_SynchroDate : When an image has been decoded, ask for its date
+ *****************************************************************************/
+mtime_t vpar_SynchroDate( vpar_thread_t * p_vpar )
+{
+ /* No need to lock, since PTS are only used by the video parser. */
+ return( p_vpar->synchro.current_pts );
+}
+
+/*****************************************************************************
+ * vpar_SynchroNewPicture: Update stream structure and PTS
+ *****************************************************************************/
+void vpar_SynchroNewPicture( vpar_thread_t * p_vpar, int i_coding_type,
+ int i_repeat_field )
+{
+ mtime_t period = 1000000 * 1001 / p_vpar->sequence.i_frame_rate;
+
+ switch( i_coding_type )
+ {
+ case I_CODING_TYPE:
+ if( p_vpar->synchro.i_eta_p
+ && p_vpar->synchro.i_eta_p != p_vpar->synchro.i_n_p )
+ {
+ intf_WarnMsg( 1, "Stream periodicity changed from P[%d] to P[%d]",
+ 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 )
+ {
+ intf_Msg( "vpar synchro stats: I(%lld) P(%lld)[%d] B(%lld)[%d] YUV(%lld) : trashed %d:%d/%d",
+ p_vpar->synchro.p_tau[I_CODING_TYPE],
+ p_vpar->synchro.p_tau[P_CODING_TYPE],
+ p_vpar->synchro.i_n_p,
+ p_vpar->synchro.p_tau[B_CODING_TYPE],
+ p_vpar->synchro.i_n_b,
+ p_vpar->p_vout->render_time,
+ p_vpar->synchro.i_not_chosen_pic,
+ p_vpar->synchro.i_trashed_pic -
+ p_vpar->synchro.i_not_chosen_pic,
+ p_vpar->synchro.i_pic );
+ p_vpar->synchro.i_trashed_pic = p_vpar->synchro.i_not_chosen_pic
+ = p_vpar->synchro.i_pic = 0;
+ }
+#endif
+ break;
+ case P_CODING_TYPE:
+ p_vpar->synchro.i_eta_p++;
+ if( p_vpar->synchro.i_eta_b
+ && p_vpar->synchro.i_eta_b != p_vpar->synchro.i_n_b )
+ {
+ intf_WarnMsg( 1, "Stream periodicity changed from B[%d] to B[%d]",
+ p_vpar->synchro.i_n_b, p_vpar->synchro.i_eta_b );
+ p_vpar->synchro.i_n_b = p_vpar->synchro.i_eta_b;
+ }
+ p_vpar->synchro.i_eta_b = 0;
+ break;
+ case B_CODING_TYPE:
+ p_vpar->synchro.i_eta_b++;
+ break;
+ }
+
+ p_vpar->synchro.current_pts += p_vpar->synchro.i_current_period
+ * (period >> 1);
+
+#define PTS_THRESHOLD (period >> 2)
+ if( i_coding_type == B_CODING_TYPE )
+ {
+ /* 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_vpar->synchro.i_current_period = i_repeat_field;
+
+ if( p_vpar->sequence.next_pts )
+ {
+ if( p_vpar->sequence.next_pts - p_vpar->synchro.current_pts
+ > PTS_THRESHOLD
+ || p_vpar->synchro.current_pts - p_vpar->sequence.next_pts
+ > PTS_THRESHOLD )
+ {
+ intf_WarnMsg( 2,
+ "vpar synchro warning: pts != current_date (%lld)",
+ p_vpar->synchro.current_pts
+ - p_vpar->sequence.next_pts );
+ }
+ p_vpar->synchro.current_pts = p_vpar->sequence.next_pts;
+ p_vpar->sequence.next_pts = 0;
+ }
+ }
+ else
+ {
+ p_vpar->synchro.i_current_period = p_vpar->synchro.i_backward_period;
+ p_vpar->synchro.i_backward_period = i_repeat_field;
+
+ if( p_vpar->synchro.backward_pts )
+ {
+ if( p_vpar->sequence.next_dts &&
+ (p_vpar->sequence.next_dts - p_vpar->synchro.backward_pts
+ > PTS_THRESHOLD
+ || p_vpar->synchro.backward_pts - p_vpar->sequence.next_dts
+ > PTS_THRESHOLD) )
+ {
+ intf_WarnMsg( 2,
+ "vpar synchro warning: backward_pts != dts (%lld)",
+ p_vpar->sequence.next_dts
+ - p_vpar->synchro.backward_pts );
+ }
+ 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 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_vpar->sequence.next_dts )
+ {
+ if( p_vpar->sequence.next_dts - p_vpar->synchro.current_pts
+ > PTS_THRESHOLD
+ || p_vpar->synchro.current_pts - p_vpar->sequence.next_dts
+ > PTS_THRESHOLD )
+ {
+ intf_WarnMsg( 2,
+ "vpar synchro warning: dts != current_pts (%lld)",
+ p_vpar->synchro.current_pts
+ - p_vpar->sequence.next_dts );
+ }
+ /* By definition of a DTS. */
+ p_vpar->synchro.current_pts = p_vpar->sequence.next_dts;
+ p_vpar->sequence.next_dts = 0;
+ }
+
+ if( p_vpar->sequence.next_pts )
+ {
+ /* Store the PTS for the next time we have to date an I picture. */
+ p_vpar->synchro.backward_pts = p_vpar->sequence.next_pts;
+ p_vpar->sequence.next_pts = 0;
+ }
+ }
+#undef PTS_THRESHOLD
+
+#ifdef STATS
+ p_vpar->synchro.i_pic++;
+#endif
}
+/*****************************************************************************
+ * SynchroType: Get the user's synchro type
+ *****************************************************************************
+ * This function is called at initialization.
+ *****************************************************************************/
+static int SynchroType( void )
+{
+ char * psz_synchro = main_GetPszVariable( VPAR_SYNCHRO_VAR, NULL );
+
+ if( psz_synchro == NULL )
+ {
+ return VPAR_SYNCHRO_DEFAULT;
+ }
+ switch( *psz_synchro++ )
+ {
+ case 'i':
+ case 'I':
+ switch( *psz_synchro++ )
+ {
+ case '\0':
+ return VPAR_SYNCHRO_I;
+
+ case '+':
+ if( *psz_synchro ) return 0;
+ return VPAR_SYNCHRO_Iplus;
+
+ case 'p':
+ case 'P':
+ switch( *psz_synchro++ )
+ {
+ case '\0':
+ return VPAR_SYNCHRO_IP;
+
+ case '+':
+ if( *psz_synchro ) return 0;
+ return VPAR_SYNCHRO_IPplus;
+
+ case 'b':
+ case 'B':
+ if( *psz_synchro ) return 0;
+ return VPAR_SYNCHRO_IPB;
+
+ default:
+ return VPAR_SYNCHRO_DEFAULT;
+
+ }
+
+ default:
+ return VPAR_SYNCHRO_DEFAULT;
+ }
+ }
+
+ return VPAR_SYNCHRO_DEFAULT;
+}
projects / vlc / blobdiff