/*****************************************************************************
- * input_clock.c: Clock/System date conversions, stream management
+ * input_clock.c: Clock/System date convertions, stream management
*****************************************************************************
- * Copyright (C) 1999, 2000 VideoLAN
- * $Id: input_clock.c,v 1.2 2001/02/07 15:32:26 massiot Exp $
+ * Copyright (C) 1999-2004 VideoLAN
+ * $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* 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
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include "defs.h"
+#include <string.h> /* memcpy(), memset() */
-#include "config.h"
-#include "common.h"
-#include "threads.h"
-#include "mtime.h"
-#include "intf_msg.h"
+#include <vlc/vlc.h>
#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
-
-#include "input.h"
+#include "input_ext-plugins.h"
/*
- * DISCUSSION : SYNCHRONIZATION METHOD
+ * DISCUSSION : SYNCHRONIZATION METHOD
*
- * In some cases we can impose the pace of reading (when reading from a
- * file or a pipe), and for the synchronization we simply sleep() until
- * it is time to deliver the packet to the decoders. When reading from
- * the network, we must be read at the same pace as the server writes,
- * otherwise the kernel's buffer will trash packets. The risk is now to
- * overflow the input buffers in case the server goes too fast, that is
- * why we do these calculations :
+ * In some cases we can impose the pace of reading (when reading from a
+ * file or a pipe), and for the synchronization we simply sleep() until
+ * it is time to deliver the packet to the decoders. When reading from
+ * the network, we must be read at the same pace as the server writes,
+ * otherwise the kernel's buffer will trash packets. The risk is now to
+ * overflow the input buffers in case the server goes too fast, that is
+ * why we do these calculations :
*
- * We compute a mean for the pcr because we want to eliminate the
- * network jitter and keep the low frequency variations. The mean is
- * in fact a low pass filter and the jitter is a high frequency signal
- * that is why it is eliminated by the filter/average.
+ * We compute a mean for the pcr because we want to eliminate the
+ * network jitter and keep the low frequency variations. The mean is
+ * in fact a low pass filter and the jitter is a high frequency signal
+ * that is why it is eliminated by the filter/average.
*
- * The low frequency variations enable us to synchronize the client clock
- * with the server clock because they represent the time variation between
- * the 2 clocks. Those variations (ie the filtered pcr) are used to compute
- * the presentation dates for the audio and video frames. With those dates
- * we can decode (or trash) the MPEG2 stream at "exactly" the same rate
- * as it is sent by the server and so we keep the synchronization between
- * the server and the client.
+ * The low frequency variations enable us to synchronize the client clock
+ * with the server clock because they represent the time variation between
+ * the 2 clocks. Those variations (ie the filtered pcr) are used to compute
+ * the presentation dates for the audio and video frames. With those dates
+ * we can decode (or trash) the MPEG2 stream at "exactly" the same rate
+ * as it is sent by the server and so we keep the synchronization between
+ * the server and the client.
*
- * It is a very important matter if you want to avoid underflow or overflow
- * in all the FIFOs, but it may be not enough.
+ * It is a very important matter if you want to avoid underflow or overflow
+ * in all the FIFOs, but it may be not enough.
+ */
+
+/* p_input->i_cr_average : Maximum number of samples used to compute the
+ * dynamic average value.
+ * We use the following formula :
+ * new_average = (old_average * c_average + new_sample_value) / (c_average +1)
*/
+static void ClockNewRef( pgrm_descriptor_t * p_pgrm,
+ mtime_t i_clock, mtime_t i_sysdate );
+
/*****************************************************************************
* Constants
*****************************************************************************/
-/* Maximum number of samples used to compute the dynamic average value.
- * We use the following formula :
- * new_average = (old_average * c_average + new_sample_value) / (c_average +1) */
-#define CR_MAX_AVERAGE_COUNTER 40
-
/* Maximum gap allowed between two CRs. */
-#define CR_MAX_GAP 1000000
+#define CR_MAX_GAP 2000000
+
+/* Latency introduced on DVDs with CR == 0 on chapter change - this is from
+ * my dice --Meuuh */
+#define CR_MEAN_PTS_GAP 300000
/*****************************************************************************
* ClockToSysdate: converts a movie clock to system date
if( p_pgrm->i_synchro_state == SYNCHRO_OK )
{
- i_sysdate = (i_clock - p_pgrm->cr_ref)
- * p_input->stream.control.i_rate
- * 300
- / 27
- / DEFAULT_RATE
- + p_pgrm->sysdate_ref;
+ i_sysdate = (mtime_t)(i_clock - p_pgrm->cr_ref)
+ * (mtime_t)p_input->stream.control.i_rate
+ * (mtime_t)300;
+ i_sysdate /= 27;
+ i_sysdate /= 1000;
+ i_sysdate += (mtime_t)p_pgrm->sysdate_ref;
}
return( i_sysdate );
}
/*****************************************************************************
- * input_ClockNewRef: writes a new clock reference
+ * ClockNewRef: writes a new clock reference
*****************************************************************************/
-void input_ClockNewRef( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm,
- mtime_t i_clock )
+static void ClockNewRef( pgrm_descriptor_t * p_pgrm,
+ mtime_t i_clock, mtime_t i_sysdate )
{
p_pgrm->cr_ref = i_clock;
- p_pgrm->sysdate_ref = mdate();
-}
-
-/*****************************************************************************
- * input_EscapeDiscontinuity: send a NULL packet to the decoders
- *****************************************************************************/
-void input_EscapeDiscontinuity( input_thread_t * p_input,
- pgrm_descriptor_t * p_pgrm )
-{
- int i_es;
-
- for( i_es = 0; i_es < p_pgrm->i_es_number; i_es++ )
- {
- es_descriptor_t * p_es = p_pgrm->pp_es[i_es];
-
- if( p_es->p_decoder_fifo != NULL )
- {
- input_NullPacket( p_input, p_es );
- }
- }
+ p_pgrm->sysdate_ref = i_sysdate ;
}
/*****************************************************************************
void input_ClockInit( pgrm_descriptor_t * p_pgrm )
{
p_pgrm->last_cr = 0;
+ p_pgrm->last_pts = 0;
p_pgrm->cr_ref = 0;
p_pgrm->sysdate_ref = 0;
p_pgrm->delta_cr = 0;
p_pgrm->c_average_count = 0;
}
+/*****************************************************************************
+ * input_ClockManageControl: handles the messages from the interface
+ *****************************************************************************
+ * Returns UNDEF_S if nothing happened, PAUSE_S if the stream was paused
+ *****************************************************************************/
+int input_ClockManageControl( input_thread_t * p_input,
+ pgrm_descriptor_t * p_pgrm, mtime_t i_clock )
+{
+ vlc_value_t val;
+ int i_return_value = UNDEF_S;
+
+ vlc_mutex_lock( &p_input->stream.stream_lock );
+
+ if( p_input->stream.i_new_status == PAUSE_S )
+ {
+ int i_old_status;
+
+ vlc_mutex_lock( &p_input->stream.control.control_lock );
+ i_old_status = p_input->stream.control.i_status;
+ p_input->stream.control.i_status = PAUSE_S;
+ vlc_mutex_unlock( &p_input->stream.control.control_lock );
+
+ vlc_cond_wait( &p_input->stream.stream_wait,
+ &p_input->stream.stream_lock );
+ ClockNewRef( p_pgrm, i_clock, p_pgrm->last_pts > mdate() ?
+ p_pgrm->last_pts : mdate() );
+
+ if( p_input->stream.i_new_status == PAUSE_S )
+ {
+ /* PAUSE_S undoes the pause state: Return to old state. */
+ vlc_mutex_lock( &p_input->stream.control.control_lock );
+ p_input->stream.control.i_status = i_old_status;
+ vlc_mutex_unlock( &p_input->stream.control.control_lock );
+
+ p_input->stream.i_new_status = UNDEF_S;
+ p_input->stream.i_new_rate = UNDEF_S;
+ }
+
+ /* We handle i_new_status != PAUSE_S below... */
+
+ i_return_value = PAUSE_S;
+ }
+
+ if( p_input->stream.i_new_status != UNDEF_S )
+ {
+ vlc_mutex_lock( &p_input->stream.control.control_lock );
+
+ p_input->stream.control.i_status = p_input->stream.i_new_status;
+
+ ClockNewRef( p_pgrm, i_clock,
+ ClockToSysdate( p_input, p_pgrm, i_clock ) );
+
+ if( p_input->stream.control.i_status == PLAYING_S )
+ {
+ p_input->stream.control.i_rate = DEFAULT_RATE;
+ p_input->stream.control.b_mute = 0;
+ }
+ else
+ {
+ p_input->stream.control.i_rate = p_input->stream.i_new_rate;
+ p_input->stream.control.b_mute = 1;
+
+ /* Feed the audio decoders with a NULL packet to avoid
+ * discontinuities. */
+ input_EscapeAudioDiscontinuity( p_input );
+ }
+
+ val.i_int = p_input->stream.control.i_rate;
+ var_Change( p_input, "rate", VLC_VAR_SETVALUE, &val, NULL );
+
+ val.i_int = p_input->stream.control.i_status;
+ var_Change( p_input, "state", VLC_VAR_SETVALUE, &val, NULL );
+
+ p_input->stream.i_new_status = UNDEF_S;
+ p_input->stream.i_new_rate = UNDEF_S;
+
+ vlc_mutex_unlock( &p_input->stream.control.control_lock );
+ }
+
+ vlc_mutex_unlock( &p_input->stream.stream_lock );
+
+ return( i_return_value );
+}
+
/*****************************************************************************
* input_ClockManageRef: manages a clock reference
*****************************************************************************/
void input_ClockManageRef( input_thread_t * p_input,
pgrm_descriptor_t * p_pgrm, mtime_t i_clock )
{
- if( p_pgrm->i_synchro_state != SYNCHRO_OK )
+ /* take selected program if none specified */
+ if( !p_pgrm )
+ {
+ p_pgrm = p_input->stream.p_selected_program;
+ }
+
+ if( ( p_pgrm->i_synchro_state != SYNCHRO_OK ) ||
+ ( i_clock == 0 && p_pgrm->last_cr != 0 ) )
{
/* Feed synchro with a new reference point. */
- input_ClockNewRef( p_input, p_pgrm, i_clock );
+ ClockNewRef( p_pgrm, i_clock,
+ p_pgrm->last_pts + CR_MEAN_PTS_GAP > mdate() ?
+ p_pgrm->last_pts + CR_MEAN_PTS_GAP : mdate() );
p_pgrm->i_synchro_state = SYNCHRO_OK;
+
+ if( p_input->stream.b_pace_control
+ && p_input->stream.p_selected_program == p_pgrm )
+ {
+ p_pgrm->last_cr = i_clock;
+ if( !p_input->b_out_pace_control )
+ {
+ mwait( ClockToSysdate( p_input, p_pgrm, i_clock ) );
+ }
+ }
+ else
+ {
+ p_pgrm->last_cr = 0;
+ p_pgrm->delta_cr = 0;
+ p_pgrm->c_average_count = 0;
+ }
}
else
{
/* Stream discontinuity, for which we haven't received a
* warning from the stream control facilities (dd-edited
* stream ?). */
- intf_WarnMsg( 3, "Clock gap, unexpected stream discontinuity" );
+ msg_Warn( p_input, "clock gap, unexpected stream discontinuity" );
input_ClockInit( p_pgrm );
p_pgrm->i_synchro_state = SYNCHRO_START;
- input_EscapeDiscontinuity( p_input, p_pgrm );
+ input_EscapeDiscontinuity( p_input );
}
p_pgrm->last_cr = i_clock;
if( p_input->stream.b_pace_control
- && p_input->stream.pp_programs[0] == p_pgrm )
+ && p_input->stream.p_selected_program == p_pgrm )
{
/* Wait a while before delivering the packets to the decoder.
* In case of multiple programs, we arbitrarily follow the
- * clock of the first program. */
- mwait( ClockToSysdate( p_input, p_pgrm, i_clock ) );
+ * clock of the selected program. */
+ if( !p_input->b_out_pace_control )
+ {
+ mwait( ClockToSysdate( p_input, p_pgrm, i_clock ) );
+ }
+
+ /* Now take into account interface changes. */
+ input_ClockManageControl( p_input, p_pgrm, i_clock );
}
else
{
mtime_t i_extrapoled_clock = ClockCurrent( p_input, p_pgrm );
/* Bresenham algorithm to smooth variations. */
- if( p_pgrm->c_average_count == CR_MAX_AVERAGE_COUNTER )
+ if( p_pgrm->c_average_count == p_input->i_cr_average )
{
p_pgrm->delta_cr = ( p_pgrm->delta_cr
- * (CR_MAX_AVERAGE_COUNTER - 1)
- + i_extrapoled_clock )
- / CR_MAX_AVERAGE_COUNTER;
+ * (p_input->i_cr_average - 1)
+ + ( i_extrapoled_clock - i_clock ) )
+ / p_input->i_cr_average;
}
else
{
p_pgrm->delta_cr = ( p_pgrm->delta_cr
* p_pgrm->c_average_count
- + i_extrapoled_clock )
+ + ( i_extrapoled_clock - i_clock ) )
/ (p_pgrm->c_average_count + 1);
p_pgrm->c_average_count++;
}
mtime_t input_ClockGetTS( input_thread_t * p_input,
pgrm_descriptor_t * p_pgrm, mtime_t i_ts )
{
+ /* take selected program if none specified */
+ if( !p_pgrm )
+ {
+ p_pgrm = p_input->stream.p_selected_program;
+ }
+
if( p_pgrm->i_synchro_state == SYNCHRO_OK )
{
- return( ClockToSysdate( p_input, p_pgrm, i_ts + p_pgrm->delta_cr )
- + DEFAULT_PTS_DELAY );
+ p_pgrm->last_pts = ClockToSysdate( p_input, p_pgrm,
+ i_ts + p_pgrm->delta_cr );
+ return( p_pgrm->last_pts + p_input->i_pts_delay );
}
else
{
projects / vlc / blobdiff