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Re: Save the HTTP Streaming Audio in iOS Device
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Re: Save the HTTP Streaming Audio in iOS Device

  • Subject: Re: Save the HTTP Streaming Audio in iOS Device
  • From: Sasikumar JP <email@hidden>
  • Date: Thu, 08 Aug 2013 10:55:11 +0530
Travis,
   Thank you for the information.

   I have tried as you suggested using AVExportSession. But AVExportSession is failed with following error.

AVAsset Export failed Error Domain=AVFoundationErrorDomain Code=-11838 "Operation Stopped" UserInfo=0x16e17000 {NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The operation is not supported for this media.}

I afraid ExportSession may not work with remote URL asset. 

To validate my observation i have tried with Apple Sample code AVSimpleEditiorIOS which uses the AVExportSession, it works fine with local URL. But when I changed to remote URL ("http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8" ). I am getting the same error "The Operation is not supported for this media".

so i think AVExportSession only works with local URL asset.

Thank you

Sasikumar JP




On Thu, Aug 8, 2013 at 9:36 AM, Travis Blankenship <email@hidden> wrote:
Sasikumar,

You're in luck. There appears to be support for HTTP live streams in the AVFoundation framework.

See page 20 (and 24) of the AVFoundation Programming Guide:
http://developer.apple.com/library/ios/DOCUMENTATION/AudioVideo/Conceptual/AVFoundationPG/AVFoundationPG.pdf#page=20

It looks like you would create an AVURLAsset, and then use AVAssetExportSession to write to disk.

AVURLAsset Class Reference:
http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVURLAsset_Class/Reference/Reference.html

AVAssetExportSession Class Reference:
http://developer.apple.com/library/ios/#DOCUMENTATION/AVFoundation/Reference/AVAssetExportSession_Class/Reference/Reference.html#//apple_ref/occ/cl/AVAssetExportSession

I hope that helps!

- Travis Blankenship
[ DJ | Producer | Graphic Designer | Programmer ]
http://tblank.com

On Aug 7, 2013, at 9:45 PM, Sasikumar JP <email@hidden> wrote:

Travis,
    I am already using audio stream API with audio unit for non http live streaming audio. I am able to save the audio data in disk.

I want to add the same support to http live audio stream. Do I have any option from av foundation framework to add this support.

If there is no support from av foundation framework,I will have add http live streaming support to my custom audio engine.
Not sure how complex to extend my audio engine to support http live streaming.

Regards
Sasikumar

Sent from my iPad

On 08-Aug-2013, at 7:18, Travis Blankenship <email@hidden> wrote:

Sasikumar,

AVFoundation is too high-level of a framework to provide access to individual audio packets. Have you tried using Audio File Stream Services (part of the AudioToolbox framework)? It seems to provide the exact functionality you're looking for.

Audio File Stream Services Reference:
https://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/AudioStreamReference/Reference/reference.html

- Travis Blankenship
[ DJ | Producer | Graphic Designer | Programmer ]
http://tblank.com

On Aug 7, 2013, at 7:33 PM, Sasikumar JP <email@hidden> wrote:

Hi,
    I have a streaming audio iOS application, I am planning to add recording feature of the streaming audio.

I have a custom audio engine for non-HTTP live streaming source, i am able to save the streaming audio content using Audio File Services API.

As my custom audio engine does not support HTTP Live streaming audio source,i am using AVPlayer to play the audio. 

i don't know how to access the raw audio packets from AV Foundation Framework API. I tried with AVAssetReader, But it does not work with Remote URL.

Could any one guide me, How to get the raw audio packets from AV Foundation framework API OR Any other way to save the HTTP streaming audio content in iOS device.

Thanks in advance.

Sasikumar JP
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References: 
 >Save the HTTP Streaming Audio in iOS Device (From: Sasikumar JP <email@hidden>)
 >Re: Save the HTTP Streaming Audio in iOS Device (From: Travis Blankenship <email@hidden>)
 >Re: Save the HTTP Streaming Audio in iOS Device (From: Sasikumar JP <email@hidden>)
 >Re: Save the HTTP Streaming Audio in iOS Device (From: Travis Blankenship <email@hidden>)

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