Re: audio processing iphone
Re: audio processing iphone
- Subject: Re: audio processing iphone
- From: Steven Winston <email@hidden>
- Date: Wed, 12 Aug 2009 10:31:00 -0700
Well semi-realtime but the answer to your first question is yes. You
can infact decode to PCM, then play it after modifications. I'm doing
this in our SRS Labs App. I'm decoding using Audio Queue Services
offline render, then modifying the PCM data that's returned. Once
that's done, I play it out using the RemoteIO audio unit.
Unfortunately, there is not a way to gain access to the folder for
file access for the ipod library. You can instruct the separate
program (ipod) to play it's files, gain a list of the meta data for
those files, however, you can't get the physical path nor access to
the file itself. We had a similar hope until just recently. I've
found that the best solution I can come up with is to stream files
from the users' machine and allow for an option to download mp3s
directly into our app. This is one of the many things I wish Apple
would relax the rules on.
On Wed, Aug 12, 2009 at 2:05 AM, Tony Sheng<email@hidden> wrote:
> thanks for replying. Steven you mentioned offline reader using Audio
> Queue Service. I wonder if we could use this for real-time rendering.
> >From the programming guide from apple, it should do this. since we
> could access the buffer, we could manipulate it before it goes to play
> out.
>
>
> I also imagine if we could copy the files from ipod library and make
> that file would access by Audio Queue Service.
>
>
> Cheers,
> Tony
>
>
> 2009/8/12 Tony Sheng <email@hidden>:
>> thanks for replying. Steven you mentioned offline reader using Audio Queue
>> Service. I wonder if we could use this for real-time rendering. From the
>> programming guide from apple, it should do this. since we could access the
>> buffer, we could manipulate it before it goes to play out.
>>
>> I also imagine if we could copy the files from ipod library and make that
>> file would access by Audio Queue Service.
>>
>> Cheers,
>> Tony
>> 2009/8/11 Chris Adamson <email@hidden>
>>>
>>> Won't work because there's no way to get the paths to the iPod library
>>> items, and they're outside your app's sandbox anyways.
>>>
>>> Access to iPod audio has been discussed extensively on
>>> devforums.apple.com. Consistent response from Apple is "file a feature
>>> request".
>>>
>>> Sent from my iPhone
>>>
>>> On Aug 11, 2009, at 12:20 PM, Tony Sheng <email@hidden>
>>> wrote:
>>>
>>>> thanks for replying. but is it possible to access the decoded PCM
>>>> audio data from AVAudioPlayer? and is that possible AVAudioPlayer
>>>> playback the sound file that referenced by media item picker ?
>>>>
>>>> thanks
>>>> tony
>>>>
>>>> 2009/8/11 Chris Adamson <email@hidden>:
>>>>>
>>>>> No, because the MPMusicPlayerController doesn't provide access to the
>>>>> decoded PCM audio data, or paths to the original song files.
>>>>>
>>>>> -Chris
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Aug 11, 2009, at 11:48 AM, Tony Sheng <email@hidden>
>>>>> wrote:
>>>>>
>>>>>> Hi everyone:
>>>>>>
>>>>>> Ask a general question, is possible to write a audio application on
>>>>>> iphone which process the audio (for example reverb effect in real time
>>>>>> ) when you playback and that audio is from a sound file from ipod
>>>>>> library. quite much like a audio plug-in working for Garageband or
>>>>>> Logic?
>>>>>>
>>>>>> thank you
>>>>>>
>>>>>> Tony
>>>>>
>>
>>
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