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-wit
h-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 protected]>
Date: Thursday, June 16, 2016 at 1:15 PM
To: Andrew Davidson <[email protected]>
Cc: coreaudio-api <[email protected]>
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 protected]> 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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