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iPhone iPad Media Q&A » audio » file 

1. How can I transcode an IMA4 ADPCM audio file recorded on the iPhone?    stackoverflow.com

For bandwidth reasons I would like to use Apple's implementation of the IMA4 format available for recording on the iPhone. This format is great for space, but it seems to be ...

2. iPhone: get duration of an audio file    stackoverflow.com

What is the easiest way to get a duration of an audio file? I could create an object of AVAudioPlayer, initialize it with URL and than get the duration, but this way ...

3. iPhone - prepend data to beginning of an audio file    stackoverflow.com

I am trying to write some data to the beginning of an audio file. But the file is getting overwritten. If I write data worth 20 seconds to the beginning ...

4. iPhone combine audio files    stackoverflow.com

I have been searching for the answer and have not been able to find it -- obviously ;) Here is what I have -- I have a list of words. Each ...

5. iPhone app with audio files is just too big. How do I reduce the size?    stackoverflow.com

I have a BlackBerry app that I am about to port to the iPhone. The app contains mp3 files which causes the BlackBerry version to be about 10MB in size (even ...

6. AudioFileOpenURL returns -43 on an existing file    stackoverflow.com

I have a step in my application where a user repeatedly hears three spoken digits. If I leave this step running for a while (for certain undefined values of "while"), my debug ...

7. Using iPhone audio files in own app - copy the audio file - is that possible?    stackoverflow.com

I like the user to pick an audio file from the available list of audio and copy it into my own app. In the retrieved items of userMediaItemCollection in the Apple ...

8. merge Audio files on iPhone    stackoverflow.com

I wanna merge a .caf file and a .mp3 file to a .mp3 file on iPhone,or I can convert them to .aac and then merge them.How can I do this ? ...

9. How to set the audio files from my app as a ringtone to my Iphone?    stackoverflow.com

I am struggling with a problem that In my application Im having audio files and I need to set those audio files as Ringtone, Alarm, Email alert or Message tone.As I ...

10. Audio file and progress bar    stackoverflow.com

I am trying to design an audio player. I need help regarding the progress bar. I want the status of progress bar to change as the audio progresses. I want progress ...

11. Create new audio file with many little audio snippets    stackoverflow.com

I want to put many little audio snippets together to a new one. This should happen randomly - therefore this new big audio file will be unique. For this reason I need ...

12. Can an iPhone app receive an audio file with out the user opening the app?    stackoverflow.com

I want to build a mobile app that has the ability to receive an audio file and then play said audio at a time previously set by the user. Does anybody ...

13. what values should i calculate from FFT of two audio file and compare it to show them they are equal?    stackoverflow.com

I want to compare two audio files(voice recording) and find whether they are identical or not (to some extent).I have come up with FFT(OouraFFT).I have integrated code and gave my ...

14. ExtAudioFileWrite producing unusable m4a aac files    stackoverflow.com

I am trying to convert a mono linear pcm file to an aac file. After much struggle I finally got it out output using the below settings, but now the file ...

15. How to append two audio files?    stackoverflow.com

I want to append two audio files in iPhone. Please help me to do this.

16. How would you compare a spoken word to an audio file?    stackoverflow.com

How would you go about comparing a spoken word to an audio file and determining if they match? For example, if I say "apple" to my iPhone application, I would ...

17. seek in audio file based on time    stackoverflow.com

Seeking through an audio file based on the packet level is simple. One just has to change currentPacket when filling the next buffer:

AudioFileReadPackets(_audioFile, false, &numBytes, _packetDescs, _currentPacket, &numPackets, buffer->mAudioData);
But what if ...

18. Select audio files created with native Voice Memo app within iOS app    stackoverflow.com

I'd like to have users of an app upload voice memos they've recorded on their iPhone. Is it possible to select audio files created by the native iOS Voice Memo app ...

19. Compare two audio files for beat/tempo and rating in iphone    stackoverflow.com

I want to develop an iPhone application which should have the ability to count the number of phrases that are received when user sing on the mic. This application should also have ...

20. How to find an audio file's length (in seconds)    stackoverflow.com

(Objective C) Just using simple AudioServicesPlaySystemSoundID and its counterparts, but I can't find in the documentation if there is already a way to find the length of an audio file. I know ...

21. Audio File Matching Program    stackoverflow.com

I'm trying to write a program in iPhone than can take two audio files (e.g. WAV) as inputs, compare them, and spit out a number that tells you how similar the ...

22. How to calculate number of samples from length of audio file?    stackoverflow.com

Given an audio file of duration say 10s, how do I find out the no of samples betweeen 2s and 8s?

23. obtain sample frame offset corresponding to certain time in audio file-iPhone    stackoverflow.com

Given an audio file of duration 10s, if I want to seek to 2s, how do I obtain the sample frame offset?

24. Tranfer audio files to NAS from iPhone using objective c?    stackoverflow.com

I want to transfer recorded audio file from iPhone to NAS. is there any solution? Thanks in advance...

25. getting the information of the audio file like author, title, album, year, etc.     stackoverflow.com

Possible Duplicate:
Reading MP3 information using objective c
for an mp3 file how i can read last 128 bytes of mp3 file

26. adding audio files iphone app    stackoverflow.com

can an iphone application download audio files from itunes directly.if yes is there any reference on how to do this any tutorial or link

27. Recommendations for a Database to Store Audio files?    stackoverflow.com

My app will download audio files e.g loops. I need a database system for the server and one for the iOS device that can handle audio files. The user should be ...

28. Asynchronous Audio file upload with iOS    stackoverflow.com

is there a way to upload an audiofile to my server asynchronously? I implemented it synchronously using the NSURLConnection class already. Maybe you could also give me a short code example. Thanks,

29. Download audio file from non direct link    stackoverflow.com

i want to implement a download manager lets say there is a form with post method on a site,after clicking the submit button the site will send the post data to its ...

30. How to access the audio files in ipHone?    stackoverflow.com

In my application iwant to access the audio files from my simulator.Imagepicker gives the all the images in our simulator.Like that i want to access the all the audio files in ...

31. How to trim audio file in iPhone?    stackoverflow.com

I have sound files in my document directory folder and i want to trim that sound file.
How to do that?

32. How to reverse an audio file?    stackoverflow.com

I'd like to reverse an existing audio file (e.g. WAV, CAF, ...) on iOS. Any suggestions on how to achieve this? Open-source libraries?

33. How can I access files outside app bundle in iPhone    stackoverflow.com

I want to create iPhone app that can play mp3 files that stored outside app bundle. The mp3 files that I want to access are stored in iPhone hard disk such ...

34. How can I Compare 2 Audio Files Programmatically?    stackoverflow.com

I want to compare 2 audio files programmatically. For example: I have a sound file in my iPhone app, and then I record another one. I want to check if the existing ...

35. export dynamically generated audio file from iphone app to iphone itunes    stackoverflow.com

I am looking into developing an Iphone app that generates noises based on user input and exports it to a file. How can I export this file in such a way ...

36. File decompression memory footprint    stackoverflow.com

I want to process audio offline on iOS, but have a query regarding memory usage. If I use AVAssetReader to decompress an MP3 to raw PCM data, the memory footprint would ...

37. Decrease size of converted audio file    stackoverflow.com

I am converting my recorded audio which is in .m4a format to .caf format. The settings of the recorded audio is as given below:

/* Record settings for recording the audio*/ 
recordSetting ...

38. how to fetch the details of the audio file in iPhone    stackoverflow.com

I made the custom player by using AVAudioPlayer. Now, I want to fetch the details of the audio file such as artist name,album name,etc which is added in the resource folder. ...

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