Re: AVAssetReader how to get file size

Subject: Re: AVAssetReader how to get file size
From: Andy Davidson <email@hidden>
Date: Thu, 16 Jun 2016 15:28:42 -0700
Thread-topic: AVAssetReader how to get file size

Hi Kevin

The following code works

Thanks

Andy

[assetWriterInput requestMediaDataWhenReadyOnQueue:mediaInputQueue

usingBlock: ^

{

// NSLog (@"top of block");

while (assetWriterInput.readyForMoreMediaData) {

CMSampleBufferRef nextBuffer = [assetReaderOutput copyNextSampleBuffer];

if (nextBuffer) {

// append buffer

[assetWriterInput appendSampleBuffer: nextBuffer];

convertedByteCount += CMSampleBufferGetTotalSampleSize (nextBuffer);

// http://stackoverflow.com/questions/19119422/convert-caf-file-to-wav-file-with-progress-bar-in-ios

CMTime progressTime = CMSampleBufferGetPresentationTimeStamp(nextBuffer);

CMTime sampleDuration = CMSampleBufferGetDuration(nextBuffer);

if (CMTIME_IS_NUMERIC(sampleDuration))

progressTime= CMTimeAdd(progressTime, sampleDuration);

float dProgress= CMTimeGetSeconds(progressTime) / CMTimeGetSeconds(songAsset.duration);

NSLLog(@"progress:%f",dProgress);

}

From: Kevin Dixon <email@hidden>
Date: Thursday, June 16, 2016 at 1:15 PM
To: Andrew Davidson <email@hidden>
Cc: coreaudio-api <email@hidden>
Subject: Re: AVAssetReader how to get file size

You will have to represent your progress bar with the duration I think. You can look at the current format settings (e.g. Sample Rate, etc) to determine how much data you've pulled out with copyNextBuffer as you go as a percentage of duration

Kevin

On Tue, Jun 14, 2016 at 12:33 PM, Andy Davidson <email@hidden> wrote:
I need to read an asset from a users iPod library and convert it to LPCM. I want put up an import progress bar. Any idea how I can find the number of bytes I need to read? PMediaItemPropertyPlaybackDuration returns the play back duration in sec.

  AVAssetReader *assetReader = [[AVAssetReader assetReaderWithAsset:songAsset
error:&assetError]
retain];
AVAssetReaderOutput *assetReaderOutput = [[AVAssetReaderAudioMixOutput
   assetReaderAudioMixOutputWithAudioTracks:songAsset.tracks
   audioSettings: nil]
retain];
if (! [assetReader canAddOutput: assetReaderOutput]) {
  return;
}
[assetReader addOutput: assetReaderOutput];

fileSize = [assetReader ????]
Thanks in advance

Andy

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References:
	>AVAssetReader how to get file size (From: Andy Davidson <email@hidden>)
	>Re: AVAssetReader how to get file size (From: Kevin Dixon <email@hidden>)

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