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Audio Mac
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| // convert audio on mac for iOS | |
| // afconvert -d [out data format] -f [out file format] [in file] [out file] | |
| afconvert -d aac -f 'caff' -b 128000 background-music-lei.caf test_128.caf | |
| afconvert -d aac -f 'caff' -b 32000 background-music-lei.caf test_32.caf | |
| afconvert -d aac -f 'caff' background-music-lei.caf test_32.caf | |
| // best formats | |
| If space is not an issue, just encode everything with linear PCM. Not only is this the fastest way for your audio to play, but you can play multiple sounds simultaneously without running into any CPU resource issues. | |
| If space is an issue, most likely you’ll want to use AAC encoding for your background music and IMA4 encoding for your sound effects. | |
| 16-bit big-endian signed integer | |
| resource: https://www.raywenderlich.com/2434-audio-tutorial-for-ios-file-and-data-formats-2014-edition |
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