| case ES_OUT_SET_PCR:
case ES_OUT_SET_GROUP_PCR:
{
......
/* TODO do not use vlc_tick_now() but proper stream acquisition date */
const bool b_low_delay = priv->b_low_delay;
bool b_extra_buffering_allowed = !b_low_delay && EsOutIsExtraBufferingAllowed( out );
vlc_tick_t i_late = input_clock_Update(
p_pgrm->p_input_clock, VLC_OBJECT(p_sys->p_input),
input_CanPaceControl(p_sys->p_input) || p_sys->b_buffering,
b_extra_buffering_allowed,
i_pcr, vlc_tick_now() );
if( !p_sys->p_pgrm )
return VLC_SUCCESS;
//如果es_out处于buffering状态，需要检查下buffering是否应该结束
if( p_sys->b_buffering )
{
/* Check buffering state on master clock update */
EsOutDecodersStopBuffering( out, false );
}
else if( p_pgrm == p_sys->p_pgrm )
{
/* Last pcr/clock update was late. We need to compensate by offsetting
from the clock the rendering dates */
if( i_late > 0 && ( !priv->p_sout ||
!priv->b_out_pace_control ) )
{
/* input_clock_GetJitter returns compound delay:
* - initial pts delay (buffering/caching)
* - jitter compensation
* - track offset pts delay
* updated on input_clock_Update
* Late/jitter amount is updated from median of late values */
vlc_tick_t i_clock_total_delay = input_clock_GetJitter( p_pgrm->p_input_clock );
/* Current jitter */
vlc_tick_t i_new_jitter = i_clock_total_delay
- p_sys->i_tracks_pts_delay
- p_sys->i_pts_delay;
/* If the clock update is late, we have 2 possibilities:
* - offset rendering a bit more by increasing the total pts-delay
* - ignore, set clock to a new reference ahead of previous one
* and flush buffers (because all previous pts will now be late) */
/* Avoid dangerously high value */
/* If the jitter increase is over our max or the total hits the maximum */
if( i_new_jitter > priv->i_jitter_max ||
i_clock_total_delay > INPUT_PTS_DELAY_MAX ||
/* jitter is always 0 due to median calculation first output
and low delay can't allow non reversible jitter increase
in branch below */
(b_low_delay && i_late > priv->i_jitter_max) )
{
msg_Err( p_sys->p_input,
"ES_OUT_SET_(GROUP_)PCR is called %d ms late (jitter of %d ms ignored)",
(int)MS_FROM_VLC_TICK(i_late),
(int)MS_FROM_VLC_TICK(i_new_jitter) );
/* don't change the current jitter */
i_new_jitter = p_sys->i_pts_jitter;
}
else
{
msg_Err( p_sys->p_input,
"ES_OUT_SET_(GROUP_)PCR is called %d ms late (pts_delay increased to %d ms)",
(int)MS_FROM_VLC_TICK(i_late),
(int)MS_FROM_VLC_TICK(i_clock_total_delay) );
}
/* Force a rebufferization when we are too late */
EsOutControlLocked( out, source, ES_OUT_RESET_PCR );
EsOutPrivControlLocked( out, ES_OUT_PRIV_SET_JITTER,
p_sys->i_pts_delay, i_new_jitter,
p_sys->i_cr_average );
}
}
return VLC_SUCCESS;
}
| 