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Re: MusicSequenceFileLoad Returns -1 on iOS10 (AudioToolbox/MusicPlayer)
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Re: MusicSequenceFileLoad Returns -1 on iOS10 (AudioToolbox/MusicPlayer)


  • Subject: Re: MusicSequenceFileLoad Returns -1 on iOS10 (AudioToolbox/MusicPlayer)
  • From: down to this <email@hidden>
  • Date: Fri, 14 Oct 2016 07:46:14 +0900

Just wanted to follow up regarding this. As per the work-around the Douglas Scott suggested below, I've implemented this successfully in my app and it is working without issues. 

For those who are unaware (as I was), the 'errno' value can simply be set directly. By updating the "errno" value to 0 after a failed call, subsequent calls to 'MusicSequenceFileLoad' generate a successful response. Therefore, I've amended my code as follows:

OSStatus statusOfInitialAttempt = CheckError(MusicSequenceFileLoad(self.masterMidiMusicSequence, (__bridge CFURLRef)midiFileURL, 0, 0), "MusicSequenceFileLoad");
if (statusOfInitialAttempt == -1) {
    errno = 0;

    OSStatus statusOfSecondAttempt = CheckErrorAndReturnOnFailure(MusicSequenceFileLoad(self.masterMidiMusicSequence, (__bridge CFURLRef)midiFileURL, 0, 0), "MusicSequenceFileLoad");

    if (statusOfSecondAttempt == -1) {
        // Handle error case
    }
}
Thanks Douglas for your help with this!

Best,

Derek


Date: Sun, 09 Oct 2016 22:15:03 -0700
From: Douglas Scott <email@hidden>
To: Sven Thoennissen <email@hidden>
Cc: email@hidden
Subject: Re: MusicSequenceFileLoad Returns -1 on iOS10
        (AudioToolbox/MusicPlayer)
Message-ID: <email@hidden">43BE2217-7A15-4F03-9338-email@hidden>
Content-Type: text/plain; charset="utf-8"

I cannot promise the specific release in which this will be fixed, but the problem is understood, and I can tell you that if you can force ‘errno’ to reset to 0, any following call to MusicSequenceFileLoadData() will succeed.

-DS
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