objective c - Offline rendering with The Amazing Audio Engine -

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this post posted on the amazing audio engine forum.

hi everyone, new amazing audio engine , ios dev, , have been trying figure out how bpm of track.

so far have found 2 articles on offline rendering on forum:

  1. http://forum.theamazingaudioengine.com/discussion/comment/1743/#comment_1743
  2. http://forum.theamazingaudioengine.com/discussion/comment/649#comment_649

as far know aeaudiocontrollerrendermainoutput function correctly implemented in this fork.

i trying offline rendering process track , use algorithm described here (javascript) , implemented here.

so far i'm loading fork, , using swift (i part of make school summer academy @ moment, teaches swift).

when playing track code works me (no offline rendering!)

let file = nsbundle.mainbundle().urlforresource("track", withextension:  "m4a") let channel: anyobject! = aeaudiofileplayer.audiofileplayerwithurl(file, audiocontroller: audiocontroller, error: nil)   audiocontroller = aeaudiocontroller(audiodescription: aeaudiocontroller.noninterleavedfloatstereoaudiodescription())  let receiver = aeblockaudioreceiver { (source, time, frames, audiobufferlist) -> void in      let leftsamples = unsafemutablepointer<float>(audiobufferlist[0].mbuffers.mdata)     // advance buffer sizeof(float) * 512     let rightsamples = unsafemutablepointer<float>(audiobufferlist[0].mbuffers.mdata) + 512      println("leftsamples: \(leftsamples) rightsamples: \(rightsamples)")   }  audiocontroller.addchannels([channel]) audiocontroller.addoutputreceiver(receiver)  audiocontroller.start()

trying offline rendering

this code trying run while using this fork

audiocontroller = aeaudiocontroller(audiodescription: aeaudiocontroller.noninterleaved16bitstereoaudiodescription())  let file = nsbundle.mainbundle().urlforresource("track", withextension: "mp3") let channel: anyobject! = aeaudiofileplayer.audiofileplayerwithurl(file, audiocontroller: audiocontroller, error: nil)  audiocontroller.addchannels([channel]) audiocontroller.start(nil) audiocontroller.stop()  var t = audiotimestamp() let bufferlength: uint32 = 4096 var buffer = aeallocateandinitaudiobufferlist(audiocontroller.audiodescription, int32(bufferlength)) aeaudiocontrollerrendermainoutput(audiocontroller, t, bufferlength, buffer)  var renderduration: nstimeinterval = channel.duration var samplerate: float64 = audiocontroller.audiodescription.msamplerate var lengthinframes: uint32 = uint32(renderduration * samplerate) var songbuffer: [float64]  t.mflags = uint32(kaudiotimestampsampletimevalid) var frequencyanalyzer = frequencyanalyzer()  println("renderduration \(renderduration)")  var outisopen = boolean()  augraphclose(audiocontroller.audiograph)  augraphisopen(audiocontroller.audiograph, &outisopen)  println("augraphisopen: \(outisopen)")  (var i: uint32 = 0; < lengthinframes; += bufferlength) {     aeaudiocontrollerrendermainoutput(audiocontroller, t, bufferlength, buffer);     t.msampletime += float64(bufferlength)      println(t.msampletime)     let leftsamples = unsafemutablepointer<int16>(buffer[0].mbuffers.mdata)     let rightsamples = unsafemutablepointer<int16>(buffer[0].mbuffers.mdata) + 512     println("leftsamples: \(leftsamples.memory) rightsamples: \(rightsamples.memory)") }    aefreeaudiobufferlist(buffer)   augraphopen(audiocontroller.audiograph) audiocontroller.start(nil) audiocontroller.stop()

offline rendering not working me atm. second example not working it's getting me lot of mixed errors don't understand.

a common 1 inside channelaudioproducer function on line:

// tell mixer/mixer's converter unit render audio status = audiounitrender(group->converterunit ? group->converterunit : group->mixeraudiounit, arg->ioactionflags, &arg->originaltimestamp, 0, *frames, audio);

it gives me exc_bad_access (code=exc_i386_gpflt). among other errors 1 common.

i sorry total noob on field stuff don't understand. should use noninterleaved16bitstereoaudiodescription or noninterleavedfloatstereoaudiodescription? how implement mdata?

i love on since i'm kind of lost @ moment. please when answer me try explain can, new stuff.

note: posting code in objective-c fine if don't know swift.


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