Re: CAClockSetCurrentTime Help
Re: CAClockSetCurrentTime Help
- Subject: Re: CAClockSetCurrentTime Help
- From: Chad Williams <email@hidden>
- Date: Thu, 05 Mar 2009 22:26:48 -0800
- Thread-topic: CAClockSetCurrentTime Help
Thank you!!! After a little toying around I was able to accomplish what I
wanted using CAClockSMPTETimeToSeconds. I must have had some bad values in
my previous attempts, because now I can receive frames.
Thanks, Chad
On 3/5/09 3:55 AM, "Doug Wyatt" <email@hidden> wrote:
> If I understand your question correctly, nonzero frames in a SMPTETime
> passed to CAClockSMPTETimeToSeconds result in fractional seconds.
> -d
>
> On Mar 4, 2009, at 12:52 , Chad Williams wrote:
>
>> I have successfully used CAClockSMPTETimeToSeconds. It works great
>> except
>> for the fact that I cannot get frames. Does
>> kCAClockTimeFormat_SMPTESeconds
>> allow me to get frames? And will it work?
>>
>> Thanks, Chad
>>
>>
>> On 3/4/09 12:29 PM, "Doug Wyatt" <email@hidden> wrote:
>>
>>> The reason for this escapes me right now, but CAClockTranslateTime
>>> won't accept kCAClockTimeFormat_SMPTETime as a source format. This
>>> affects other APIs like CAClockSetCurrentTime, which use
>>> TranslateTime
>>> underneath the hood.
>>>
>>> You should be able to use CAClockSMPTETimeToSeconds to obtain a time
>>> in seconds which can then be passed to SetCurrentTime.
>>>
>>> Doug
>>>
>>>
>>> On Mar 4, 2009, at 12:09 , Chad Williams wrote:
>>>
>>>> Sorry if this is a resend. This message didn¹t show up in my sent
>>>> items or inbox for the Core Audio List.
>>>>
>>>> - Chad
>>>>
>>>> Here are the values that I am assigning to clockTime.time. I am
>>>> including the console readout and the code that works to convert
>>>> SMPTE to seconds.
>>>>
>>>> Thanks, Chad
>>>>
>>>> {
>>>> OSStatus err;
>>>> //SMPTETime smpteTime;
>>>> CAClockTime clockTime;
>>>> //CAClockSeconds seconds;
>>>>
>>>> NSLog(@"SMPTE Time - %2.2hi:%2.2hi:%2.2hi:%2.2hi",(SInt16)
>>>> [hhField intValue], (SInt16)[mmField intValue], (SInt16)[ssField
>>>> intValue], (SInt16)[ffField intValue]);
>>>>
>>>> clockTime.format = kCAClockTimeFormat_SMPTETime;
>>>> clockTime.time.smpte.mType = kSMPTETimeType30;
>>>> clockTime.time.smpte.mHours = (SInt16)[hhField intValue];
>>>> clockTime.time.smpte.mMinutes = (SInt16)[mmField intValue];
>>>> clockTime.time.smpte.mSeconds = (SInt16)[ssField intValue];
>>>> clockTime.time.smpte.mFrames = (SInt16)[ffField intValue];
>>>> clockTime.time.smpte.mSubframeDivisor = 80;
>>>> clockTime.time.smpte.mSubframes = 0;
>>>>
>>>> err = CAClockSetCurrentTime(clockRef, &clockTime);
>>>> if (err != noErr) {
>>>> NSLog(@"SMPTETimeToSecond err = %d", err);
>>>> return;
>>>> }
>>>>
>>>> /*
>>>> smpteTime.mType = kSMPTETimeType30;
>>>> smpteTime.mHours = (SInt16)[hhField intValue];
>>>> smpteTime.mMinutes = (SInt16)[mmField intValue];
>>>> smpteTime.mSeconds = (SInt16)[ssField intValue];
>>>> smpteTime.mFrames = (SInt16)[ffField intValue];
>>>> smpteTime.mSubframeDivisor = 80;
>>>> smpteTime.mSubframes = 0;
>>>> CAClockSMPTETimeToSeconds(clockRef, &smpteTime, &seconds);
>>>>
>>>> CAClockTime secondTime;
>>>> secondTime.format = kCAClockTimeFormat_Seconds;
>>>> secondTime.time.seconds = seconds;
>>>> CAClockSetCurrentTime(clockRef, &secondTime);
>>>> */
>>>> }
>>>>
>>>> 2009-03-03 10:49:21.794 FlexMTC[4038:10b] SMPTE Time - 02:00:01:26
>>>> 2009-03-03 10:49:21.818 FlexMTC[4038:10b] SMPTETimeToSecond err =
>>>> -66814
>>>> 2009-03-03 10:49:24.106 FlexMTC[4038:10b] SMPTE Time - 02:01:01:26
>>>> 2009-03-03 10:49:24.107 FlexMTC[4038:10b] SMPTETimeToSecond err =
>>>> -66814
>>>> 2009-03-03 10:49:24.330 FlexMTC[4038:10b] SMPTE Time - 02:13:01:26
>>>> 2009-03-03 10:49:24.331 FlexMTC[4038:10b] SMPTETimeToSecond err =
>>>> -66814
>>>> 2009-03-03 10:49:35.642 FlexMTC[4038:10b] SMPTE Time - 02:13:01:26
>>>> 2009-03-03 10:49:35.643 FlexMTC[4038:10b] SMPTETimeToSecond err =
>>>> -66814
>>>> 2009-03-03 10:49:36.178 FlexMTC[4038:10b] SMPTE Time - 02:13:16:26
>>>> 2009-03-03 10:49:36.178 FlexMTC[4038:10b] SMPTETimeToSecond err =
>>>> -66814
>>>>
>>>>
>>>> On 3/3/09 8:38 AM, "Doug Wyatt" <email@hidden> wrote:
>>>>
>>>>> What are the values in clockTime.time? What is the error?
>>>>>
>>>>> On Mar 3, 2009, at 0:20 , Chad Williams wrote:
>>>>>
>>>>>> Thank you for all of the Core Audio postings. They have been
>>>> extremely
>>>>>> helpful to me. I have a bit of a dilemma. I can't seem to set the
>>>>>> CAClockTime from a SMPTETime. Any help would be great. I am trying
>>>>>> to set
>>>>>> the value from NSTextFields. The code compiles with no errors...I
>>>>>> just get
>>>>>> "err" when CAClockSetCurrentTime() is called. I have no issues
>>>>>> setting the
>>>>>> time from seconds.
>>>>>>
>>>>>> OSStatus err;
>>>>>> CAClockTime clockTime;
>>>>>>
>>>>>> clockTime.format = kCAClockTimeFormat_SMPTETime;
>>>>>> clockTime.time.smpte.mType = kSMPTETimeType30;
>>>>>> clockTime.time.smpte.mHours = (SInt16)[hhField intValue];
>>>>>> clockTime.time.smpte.mMinutes = (SInt16)[mmField intValue];
>>>>>> clockTime.time.smpte.mSeconds = (SInt16)[ssField intValue];
>>>>>> clockTime.time.smpte.mFrames = (SInt16)[ffField intValue];
>>>>>> clockTime.time.smpte.mSubframeDivisor = 80;
>>>>>> clockTime.time.smpte.mSubframes = 0;
>>>>>>
>>>>>> err = CAClockSetCurrentTime(clockRef, &clockTime);
>>>>>> if (err != noErr) {
>>>>>> NSLog(@"setClockToSMPTETime err = %d", err);
>>>>>> }
>>>>>>
>>>>>> Thanks, Chad
>>>>>
>>>>>
>>>
>>>
>>
>>
>
>
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