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<blockquote data-quote="nacho4d" data-source="post: 738590" data-attributes="member: 62897">Hi.(I have to say that I am quite new to Core Audio.)I am trying to use AudioQueueEnqueueBufferWithParameters function so I can enqueue buffers corresponding a certain time, like song navigation. (suppose a have a GUI time line, (for example UISlider) and I want to be able to go to any audio's position in time, so I can enqueue the corresponding buffers to that time and enqueue them to be played -&gt; As far as&nbsp; I understand this can be accomplished by using AudioQueueEnqueueBufferWithParameters)For example in iPhone speakHere project &gt; AudioPlayer.m &gt; playbackCall functionthere is&nbsp; [CODE]AudioQueueEnqueueBuffer (&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; inAudioQueue,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bufferReference,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ([ player packetDescriptions ] ? numPackets : 0),&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; [ player packetDescriptions ]&nbsp; &nbsp; &nbsp; &nbsp; );[/CODE]but I want to have more control so I would use[CODE]UInt32 inTrimFramesAtStart, inTrimFramesAtEnd;AudioQueueTimelineRef myOutTimeline; AudioQueueCreateTimeline(inAudioQueue, &amp;myOutTimeline); //is this correct?AudioQueueEnqueueBufferWithParameters(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; inAudioQueue,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bufferReference,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ([player packetDescriptions] ? numPackets : 0),&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; [player packetDescriptions],&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; inTrimFramesAtStart,&nbsp; //???????&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; inTrimFramesAtEnd,&nbsp; &nbsp; //???????&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0,&nbsp; //since I am not passing any parameter&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NULL,&nbsp; //since I am not setting any parameter&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; NULL,&nbsp; //ASAP&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &amp;myOuTimeline, //something tells me that is not good&nbsp; &nbsp; &nbsp; &nbsp; );[/CODE]As you can see this function's parameters are incomplete. I have read the documentation but I still cannot get what the heck put inside inTrimFramesAtStart and inTrimFramesAtEnd and &amp;myOutTimelineCan any one explain me kindly? I would be very pleased.Thanks in advance.</blockquote>

[QUOTE="nacho4d, post: 738590, member: 62897"] Hi. (I have to say that I am quite new to Core Audio.) I am trying to use AudioQueueEnqueueBufferWithParameters function so I can enqueue buffers corresponding a certain time, like song navigation. (suppose a have a GUI time line, (for example UISlider) and I want to be able to go to any audio's position in time, so I can enqueue the corresponding buffers to that time and enqueue them to be played -> As far as I understand this can be accomplished by using AudioQueueEnqueueBufferWithParameters) For example in iPhone speakHere project > AudioPlayer.m > playbackCall function there is [CODE]AudioQueueEnqueueBuffer ( inAudioQueue, bufferReference, ([ player packetDescriptions ] ? numPackets : 0), [ player packetDescriptions ] );[/CODE] but I want to have more control so I would use [CODE]UInt32 inTrimFramesAtStart, inTrimFramesAtEnd; AudioQueueTimelineRef myOutTimeline; AudioQueueCreateTimeline(inAudioQueue, &myOutTimeline); //is this correct? AudioQueueEnqueueBufferWithParameters( inAudioQueue, bufferReference, ([player packetDescriptions] ? numPackets : 0), [player packetDescriptions], inTrimFramesAtStart, //??????? inTrimFramesAtEnd, //??????? 0, //since I am not passing any parameter NULL, //since I am not setting any parameter NULL, //ASAP &myOuTimeline, //something tells me that is not good );[/CODE] As you can see this function's parameters are incomplete. I have read the documentation but I still cannot get what the heck put inside inTrimFramesAtStart and inTrimFramesAtEnd and &myOutTimeline Can any one explain me kindly? I would be very pleased. Thanks in advance. [/QUOTE]

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