AVAudioPlayer: Second instance of same sound...
AVAudioPlayer: Second instance of same sound...
- Subject: AVAudioPlayer: Second instance of same sound...
- From: uɐıʇəqɐz pnoqɥɒɯ <email@hidden>
- Date: Mon, 16 Nov 2009 22:54:01 -0800
Hi. This is an iPhone question. I am wondering if AVAudioPlayer
cache's sound files such that the loading of the second instance of
the same sound file doesn't take up additional memory.
In other words:
if fileURL points to a 15 megabyte sound file, and you call
newPlayer1 = [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL
error: nil];
newPlayer2 = [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL
error: nil];
would the second call consume the same amount of memory as the first
one? Or will the second call's memory usage be limited to just a few
dozen or less bytes?
What Am I Really Trying To Do?
I have many sound files, each about 500K that I play, sometimes
playing the same sound, two or more times in an overlapping fashion.
In order to play the same sound overlapped, I have to load that sound
twice in order to give each an independent -play. This all works great.
In order to make the creation of these 400+ sounds a bit easier, I
would like to combine them and group them into single sound files with
50 sounds in each (18-20MB per file), and then before I call -play, I
specify an offset to start playing at, and cut off the playback after
a delay. I am currently making the changes and realized that I will
have to handle the case that two sounds from the same file will play
concurrently, much more often. In fact, I could easily have 4, 5 or
more sounds from the same file playing simultaneously. That means I
would have to call -initWithContentsOfURL multiple times in order to
play a second, third, fourth... sound from that file. If each
instance of this sound file takes up 18-20 MB, then my iPhone app is
going have serious problems after the second instance.
Alternatively, I can write a separate Mac application that opens up
each of my larger combined files, and reads out the sounds at each
offset and saves them to smaller files, as I am currently using,
except, of course, I am sure it is not as easy as just opening a file,
moving to a location x seconds times sample rate in, grab y seconds
of data, and write it out, and have a valid sound file. Is there
already a utility such as afconvert that can do this for me?
Thank you in advance for any thoughts and advice!
-mahboud
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