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86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef _SFX_TIME_H_
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#define _SFX_TIME_H_
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namespace Sci {
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typedef struct {
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long secs;
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long usecs;
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int frame_rate;
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int frame_offset;
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/* Total time: secs + usecs + frame_offset/frame_rate */
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} sfx_timestamp_t;
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sfx_timestamp_t sfx_new_timestamp(long secs, long usecs, int frame_rate);
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/* Creates a new mutable timestamp
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** Parameters: (long x long) (secs, usecs): Initial timestamp
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** (int) frame_rate: Frame rate, for increasing the time stamp
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*/
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sfx_timestamp_t sfx_timestamp_add(sfx_timestamp_t timestamp, int frames);
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/* Adds a number of frames to a timestamp
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** Parameters: (sfx_timestampt_t *) timestamp: The timestamp to update
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** (int) frames: Number of frames to add
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** Returns : (sfx_timestamp_t) The increased timestamp
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*/
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sfx_timestamp_t sfx_timestamp_renormalise(sfx_timestamp_t timestamp, int new_freq);
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/* Translates a timestamp to a new base frame frequency
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** Parameters: (sfx_timestamp_t *) timestamp: The timestamp to normalise
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** (int) new_freq: The new frequency to normalise to
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** Returns : (sfx_timestamp_t) The re-normalised timestamp
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** The translation looses accuracy in the order of magnitude of milliseconds
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** for "usual" sampling frequencies.
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*/
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int sfx_timestamp_frame_diff(sfx_timestamp_t a, sfx_timestamp_t b);
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/* Computes the difference (# of frames) between two timestamps
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** Parameters: (sfx_timestamp) a: See below
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** (sfx_timestamp) b: See below
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** Returns : (int) a-b
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*/
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long sfx_timestamp_usecs_diff(sfx_timestamp_t a, sfx_timestamp_t b);
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/* Computes the difference (# of microseconds) between two timestamps
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** Parameters: (sfx_timestamp) a: See below
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** (sfx_timestamp) b: See below
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** Returns : (long) a-b
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*/
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void sfx_timestamp_gettime(sfx_timestamp_t *timestamp, long *secs, long *usecs);
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/* Determines the time described by a given timestamp
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** Parameters: (sfx_timestamp_t *) timestamp: Timestamp to read from
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** Returns : (int * x int *) (secs, usecs): Seconds and microseconds since
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** the epoch described there
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*/
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} // End of namespace Sci
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#endif /* !defined(_SFX_TIME_H_) */
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