diff options
Diffstat (limited to 'trunk/TAO/orbsvcs/orbsvcs/AV/media_timer.cpp')
-rw-r--r-- | trunk/TAO/orbsvcs/orbsvcs/AV/media_timer.cpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/trunk/TAO/orbsvcs/orbsvcs/AV/media_timer.cpp b/trunk/TAO/orbsvcs/orbsvcs/AV/media_timer.cpp new file mode 100644 index 00000000000..1a5b9cd1e42 --- /dev/null +++ b/trunk/TAO/orbsvcs/orbsvcs/AV/media_timer.cpp @@ -0,0 +1,95 @@ +//$Id$ +/* + * Copyright (c) 1995 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the Computer Systems + * Engineering Group at Lawrence Berkeley Laboratory. + * 4. Neither the name of the University nor of the Laboratory may be used + * to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* +static const char rcsid[] = + "@(#) $Header$"; +*/ + +#include "orbsvcs/AV/media_timer.h" +#include "ace/Time_Value.h" +#include "ace/OS_NS_sys_time.h" +#include "ace/OS_NS_stdlib.h" + +TAO_BEGIN_VERSIONED_NAMESPACE_DECL + +MediaTimer* MediaTimer::instance_; + +MediaTimer::MediaTimer() +{ + instance_ = this; + offset_ = ACE_OS::rand (); +} + +MediaTimer::~MediaTimer() +{ + instance_ = 0; +} + +/* + * Default media timestamp -- convert unix system clock + * into a 90Khz timestamp. Grabbers override this virtual + * method if they can provide their own time base. + * + * XXX + * We save the corresponding unix time stamp to handle the + * unix_ts() call the transmitter will make to get the correspondence + * between the media timestamp & unix time. + */ +ACE_UINT32 MediaTimer::media_ts() +{ + //timeval tv; + ACE_Time_Value tv = ACE_OS::gettimeofday(); + ACE_UINT32 u = tv.usec (); + u = (u << 3) + u; /* x 9 */ + /* sec * 90Khz + (usec * 90Khz) / 1e6 */ + u = tv.sec () * 90000 + (u / 100); + return (u + offset_); +} + +/* + * compute media time corresponding to the current unix time. + * in this generic routine, this is the same as media_ts() but, + * if a grabber has hardware or kernel timestamping, this routine + * must compute the correspondence between the hardware timestamp + * and the unix clock and appropriately offset the timestamp to + * correspond to the current clock. (This information if vital + * for cross-media synchronization.) + */ +ACE_UINT32 MediaTimer::ref_ts() +{ + return (media_ts()); +} + +TAO_END_VERSIONED_NAMESPACE_DECL |