CODEWITHSUNDEEP
objective-caudioaudiotoolbox
andrey
andrey

Reputation: 681

How do I read audio files with AudioToolbox Framework?

I want to read data from wave, mp3, and aiff files and use this data for fft. AudioToolbox Framework looks good, but there is a lot of different and similar functions and its confusing for me.

Can you help me with list of functions ? So I need to get numberOfFrames, channel, sampleRate, bitRate and array with audioData.

thanks.

Upvotes: 0

Views: 663

Answers (1)

user1587368
user1587368

Reputation: 316

You need to load your file, and get property and read.

ExtAudioFileRef myfile;
ExtAudioFileOpenURL(yourURL, &myfile);

// after you get a AudioStreamBasicDescription
AudioStreamBasicDescription desc={0};
ExtAudioFileGetProperty(myfile, kExtAudioFileProperty_FileDataFormat, sizeof(AudioStreamBasicDescription), &desc);
AudioBufferList *ioData = CreateAudioBuffer(desc);
UInt32 nbFrames = 512;
while(nbFrames != 0)
{
     nbFrames = 512;
     ExtAudioFileRead(myfile, &nbFrames, ioData);
     WorkWithFrame(ioData, nbFrames);
}

ExtAudioFileDispose(myfile);

You need to write CreateAudioBuffer with data malloc and WorkWithFrames.

I hope this can help you.

Upvotes: 1

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