Re: afinfo
Re: afinfo
- Subject: Re: afinfo
- From: Jean-Daniel Dupas <email@hidden>
- Date: Fri, 5 Nov 2010 15:59:49 +0100
Yes. This property can only be used with the AudioFileAPI.
If you opened your file using ExtAudioFile API, you can get the underlying AudioFileID by querying the kExtAudioFileProperty_AudioFile property.
And then, you can query the estimated duration using AudioFileGetProperty().
AFAIK, AudioFile API does not provide a way to directly get the exact duration, that's why I suggested ExtAudioFile in the first place. But if you only need estimated duration, it may be more efficient to use AudioFileOpenURL directly.
Le 5 nov. 2010 à 15:42, Robert Martin a écrit :
> Try AudioFileOpenURL and AudioFileGetProperty (not ExtAudioFile)
>
> On Nov 5, 2010, at 9:52 AM, email@hidden wrote:
>
>> Hi,
>>
>> I tried to get the kAudioFilePropertyEstimatedDuration property,
>> but I always receive an error ( NSLog(@"property error") )
>> and the value of seconds is 0.
>> What am I doing wrong ?
>> I would be very thankful for an answer.
>>
>> Karsten
>>
>>
>> -(void) duration
>>
>> {
>> NSURL *inputFileURL = [NSURL fileURLWithPath:PathName];
>> OSStatus Error = noErr;
>> ExtAudioFileRef file;
>> Error = ExtAudioFileOpenURL((CFURLRef)inputFileURL, &file);
>> if(Error != 0) NSLog(@"file not loaded");
>> NSTimeInterval seconds;
>> //Float64 seconds; ??
>> UInt32 propertySize = sizeof(seconds);
>> Error = ExtAudioFileGetProperty(file, kAudioFilePropertyEstimatedDuration, &propertySize, &seconds);
>> if(Error != 0) NSLog(@"property error");
>>
>> NSLog(@"duration: %f", seconds);
>> if(Error != 0) NSLog(@"error");
>> //printf("duration %f \n",seconds);
>>
>> ExtAudioFileDispose(file);
>>
>> }
>
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| References: | |
| | >Re: afinfo (From: "email@hidden" <email@hidden>) |
| | >Re: afinfo (From: Robert Martin <email@hidden>) |