clock.h
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:5k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * clock.h: clocks synchronisation
- *****************************************************************************
- * Copyright (C) 2008 the VideoLAN team
- * Copyright (C) 2008 Laurent Aimar
- * $Id: ff50c8233d223db6f1a201d60f266c74ba8b38c4 $
- *
- * Authors: Laurent Aimar < fenrir _AT_ videolan _DOT_ org >
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #if defined(__PLUGIN__) || defined(__BUILTIN__) || !defined(__LIBVLC__)
- # error This header file can only be included from LibVLC.
- #endif
- #ifndef _INPUT_CLOCK_H
- #define _INPUT_CLOCK_H 1
- #include <vlc_common.h>
- #include <vlc_input.h> /* FIXME Needed for input_clock_t */
- /** @struct input_clock_t
- * This structure is used to manage clock drift and reception jitters
- *
- * XXX input_clock_GetTS can be called from any threads. All others functions
- * MUST be called from one and only one thread.
- */
- /**
- * This function creates a new input_clock_t.
- * You must use input_clock_Delete to delete it once unused.
- */
- input_clock_t *input_clock_New( int i_rate );
- /**
- * This function destroys a input_clock_t created by input_clock_New.
- */
- void input_clock_Delete( input_clock_t * );
- /**
- * This function will update a input_clock_t with a new clock reference point.
- * It will also tell if the clock point is late regarding our buffering.
- *
- * param b_buffering_allowed tells if we are allowed to bufferize more data in
- * advanced (if possible).
- */
- void input_clock_Update( input_clock_t *, vlc_object_t *p_log,
- bool *pb_late,
- bool b_can_pace_control, bool b_buffering_allowed,
- mtime_t i_clock, mtime_t i_system );
- /**
- * This function will reset the drift of a input_clock_t.
- *
- * The actual jitter estimation will not be reseted by it.
- */
- void input_clock_Reset( input_clock_t * );
- /**
- * This functions will return a deadline used to control the reading speed.
- */
- mtime_t input_clock_GetWakeup( input_clock_t * );
- /**
- * This functions allows to change the actual reading speed.
- */
- void input_clock_ChangeRate( input_clock_t *, int i_rate );
- /**
- * This function allows to change the pause status.
- */
- void input_clock_ChangePause( input_clock_t *, bool b_paused, mtime_t i_date );
- /**
- * This function allows to rebase the original system value date.
- * It can be called only imediatly after a input_clock_Update call.
- * FIXME ugly
- */
- void input_clock_ChangeSystemOrigin( input_clock_t *, mtime_t i_system );
- /**
- * This function converts a pair of timestamp from stream clock to system clock.
- *
- * If pi_rate is provided it will be filled with the rate value used for
- * the conversion.
- * p_ts0 is a pointer to a timestamp to be converted (in place) and must be non NULL.
- * p_ts1 is a pointer to a timestamp to be converted (in place) and can be NULL.
- *
- * It will return VLC_EGENERIC if i_ts_bound is not INT64_MAX and if the value *p_ts0
- * after conversion is not before the deadline mdate() + i_pts_delay + i_ts_bound.
- * It will also return VLC_EGENERIC if the conversion cannot be done successfully. In
- * this case, *p_ts0 and *p_ts1 will hold an invalid timestamp.
- * Otherwise it will return VLC_SUCCESS.
- */
- int input_clock_ConvertTS( input_clock_t *, int *pi_rate, mtime_t *pi_ts0, mtime_t *pi_ts1, mtime_t i_ts_bound );
- /**
- * This function returns the current rate.
- */
- int input_clock_GetRate( input_clock_t * );
- /**
- * This function returns current clock state or VLC_EGENERIC if there is not a
- * reference point.
- */
- int input_clock_GetState( input_clock_t *,
- mtime_t *pi_stream_start, mtime_t *pi_system_start,
- mtime_t *pi_stream_duration, mtime_t *pi_system_duration );
- /**
- * This function allows the set the minimal configuration for the jitter estimation algo.
- */
- void input_clock_SetJitter( input_clock_t *,
- mtime_t i_pts_delay, int i_cr_average );
- /**
- * This function returns an estimation of the pts_delay needed to avoid rebufferization.
- * XXX in the current implementation, the pts_delay will never be decreased.
- */
- mtime_t input_clock_GetJitter( input_clock_t * );
- #endif