I'd like to change the pitch of an audio file by changing the sample rate programmatically. I am recording the file using AVAudioRecorder. I have noticed a settings parameter within AVAudioPlayer, however, it is read only. Can anyone lend a helping hand? :)
You could manipulate the data the recording process returns, this is generally the way to go for DSP.
A simple change in sound's speed can be done with a resampling.
Take a look here
Related
AVFoundation has been quite a struggle for me because most of the examples and documentation out there are in Obj-c.. As my title states, I would like to write to file in real time instead of calling exportAsync once the user has finished recording their video.
If anyone can offer some advice or documentation on how to do this it would be greatly appreciated!
It's not clear where your video is coming from, butexportAsync makes it sound like you're using AVAssetExportSession with an existing file or composition.
capture your video (and audio?) frames
a. if from an existing composition or file, with AVAssetReader
b. if from the camera, with AVCaptureSession etc
progressively write the frames to file using AVAssetWriter & AVAssetWriterInput
If you're expecting the writing to file to be interrupted for some reason,
consider setting the AVAssetWriter's movieFragmentInterval property to something small .
I am developing an application for recording audio and play it with a beat in background and also save it for further use, right now i am just able to play it with background using two instances of AVAudioPlayer but when i am going to save them i had no idea how to because these are two different sound file ,now only way to save it is to merge both file but i had no idea how to mix them. Ideas and Suggestions are welcomed.
i did the audiotask, just check that and tell what help you what you need
Can somebody tell me how to scrub the AQPlayer ( used in Apple's SpeakHere example ) using a UISlider like the iPod does?
I know how to handle the slider part, but once I have my value from the slider, what do I need to set/change/update in AQPlayer, or the AudioQueue, so that the player moves to that part of the Queue and continues playing from that point?
Is there any easy way to do this with a percentage of the playing time or do I have to make some calculations with the packets??
Thanks for any input.
Al
For anyone who also needs to seek/scrubb in an audio file, I found a solution to my question at the following link: Audio Queues
Have a look at the function
-(void)seek:(UInt64)packetOffset;
It worked perfectly after some initial fine tuning.
I have been facing this since so many days but I have not reach to any conclusion.
My problem is : I want to play an mp3 file but not simply by clicking on a play button.
It is this way I want to play it.
*There is a slider that I can drag using finger, I want that the mp3 should play with the frequency with which I am dragging the finger (or speed with which I am dragging my finger, so that it will give an effect of fast forwarding (funny type of voice)) or if I drag slider slowyly the output will be slow *
The problem is the output of the sound is not coming out smooth. its very distorted and disturbed voice.
I want the outuput to be smoother.
Please help. Any suggestions please. Presently I am using AVAudioPlayer and passing the time value based upon slider input to play the file. (It does not seems to be feasible though).
I feel that it is possible using openAL only and no other way. Because using openAL we can modify the frequency of the sound file (pitch)
CAN SOME ONE PLEASE REFER ME A LINK TO openAL implementation for iPhone . I have never played a sound file using openAL
Help!!
You won't be able to do it with AVAudioPlayer, as it does not support pitch operations.
You can load and decode the entire track into memory for playback with OpenAL (which supports pitch), or you can do realtime loading/decoding and pitch changing using Audio Units (MUCH lower level, and more complicated, though).
Can anyone tell me how to detect a sound on iphone....
Please help....please provide any source code or link if possible
You can use AVAudioRecorder
http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/
That tutorial works for any sound really... it goes through the steps of creating a high-pass filter to try and only detect blowing. You can change the values to make it more sensitive to sound or less sensitive.