Re: WMA on the iPhone
Re: WMA on the iPhone
- Subject: Re: WMA on the iPhone
- From: Marco Papa <email@hidden>
- Date: Wed, 14 Jan 2009 08:55:13 -0800
On Wed, Jan 14, 2009 at 4:39 AM, William Stewart
<email@hidden> wrote:
Just for the sake of clarity.
When you decode a compressed format (like WMA) you decode it to linear pcm.
Actually you "decode" WMA and "encode" Linear PCM.
On Jan 12, 2009, at 10:29 AM, Marco Papa wrote:
Date: Sat, 10 Jan 2009 16:09:43 -0500
From: Norman Franke Lists <email@hidden>
Subject: Re: WMA on the iPhone
To: CoreAudio API <email@hidden>
Message-ID: <email@hidden" target="_blank">email@hidden>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I'd guess the issue is that the iPhone may not have enough CPU to
decode WMA and do anything else. Transcoding, if possible, would allow
the audio hardware to do the heavy lifting.
-Norman Franke
There's plenty of CPU to decode on the iPhone. I know of at least three other products on the AppStore that use the FFMPEG library to decode WMA, and encode on-the-fly into another format (likely Linear PCM) and feed the resulting audio to the iPhone audio queues. This is with WMA streams as high as 192 Kbps, which is plenty for good sound.
-- Marco
--
Marco Papa, Ph.D.
Computer Science Department
University of Southern California
Henry Salvatori Computer Center
Los Angeles, California 90089-0781
Voice: +1-213-974-2137
Cell: +1-310-944-5468
E-mail:
email@hidden
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