ZipIt Audio - Revision history

Prpplague at 18:52, 24 September 2007

2007-09-24T18:52:50Z

Prpplague at 18:52, 24 September 2007

2007-09-24T18:52:34Z

Chris at 10:29, 14 July 2007

2007-07-14T10:29:27Z

RBot: Bot (Edward's framework)

2007-03-07T03:34:48Z

Bot (Edward's framework)

New page

The Zipit is a fairly capable audio device. There are several applications that can play audio on the Zipit. [http://groups.yahoo.com/group/zipitwireless Yahoo! group.] has some of these in the files section (see [[Open Zipit]] / Applications / Freebase for example)

Thanks to [[Ken Mc Guire]], The [[ZipIt]]'s audio hardware is supported and you have access to a standard OSS-style audio device. This means that any application that works with /dev/dsp ''should'' work once compiled for the [[ZipIt]]. The Device names are a little different than what you may be used to by default. They are:

<pre>

Mixer: /dev/zipm # mknod /dev/zipm c 245 0

Audio: /dev/zipaudio # mknod /dev/zipaudio c 245 4

DSP: /dev/zipd # mknod /dev/zipd c 245 3

</pre>

The zipaudio device is the one you wind up dealing with most often. As on any other linux machine you can cat wav files to it and hear sound, provided the wav files are encoded to exactly what the zipaudio device is expecting.

Generally speaking, the zipaudio device expects audio data in RAW format at 44100 Hz, 2 channel, 16bits (signed little-endian) per sample. This equates to the following SOX output options:

sox inputfile.wav -t raw -c 2 -r 44100 -w -s output.wav

'''Note''': ''If your audio file was created on a big-endian machine (powerpc, etc) you need to swap the bytes using the -x flag to sox''

The big limitation on audio capability on the [[ZipIt]] is CPU power. The [[ZipIt]]'s 90Mhz Arm CPU does not give you a lot of room for audio processing. Though some users have had success with audio decoding on the [[ZipIt]], at 'average' bitrates, decoding the audio and playing it back seems to take the majority of the CPU.

Other applications running while performing MP3 or OGG decoding tend to make the audio 'skip' from time to time - though a well optimized / buffered player can minimize or even alleviate this.

The company that makes and markets the [[ZipIt]], [http://zipitwireless.com/ ZipitWireless] has recently released an update that allows users to listen to music from their PC. Though little is known about how this is actually accomplished, it is believed that the decoding occurs on the PC, and raw audio is streamed to the [[ZipIt]].

Similar functionality has been developed on [[OpenZipIt]] by [[Jay Kuri]] allowing users to stream any audio from their Linux desktop to their [[ZipIt]]. (note: add link to setup instructions)

← Older revision		Revision as of 18:52, 24 September 2007
Line 1:		Line 1:
−	The Zipit is a fairly capable audio device. There are several applications that can play audio on the Zipit. [http://groups.yahoo.com/group/zipitwireless Yahoo! group.] has some of these in the files section (see [[~~OpenZipit~~]] / Applications / Freebase for example)	+	The Zipit is a fairly capable audio device. There are several applications that can play audio on the Zipit. [http://groups.yahoo.com/group/zipitwireless Yahoo! group.] has some of these in the files section (see [[OpenZipIt]] / Applications / Freebase for example)

	Thanks to Ken McGuire, The [[ZipIt]]'s audio hardware is supported and you have access to a standard OSS-style audio device. This means that any application that works with /dev/dsp ''should'' work once compiled for the [[ZipIt]]. The Device names are a little different than what you may be used to by default. They are:		Thanks to Ken McGuire, The [[ZipIt]]'s audio hardware is supported and you have access to a standard OSS-style audio device. This means that any application that works with /dev/dsp ''should'' work once compiled for the [[ZipIt]]. The Device names are a little different than what you may be used to by default. They are:

← Older revision		Revision as of 18:52, 24 September 2007
Line 1:		Line 1:
−	The Zipit is a fairly capable audio device. There are several applications that can play audio on the Zipit. [http://groups.yahoo.com/group/zipitwireless Yahoo! group.] has some of these in the files section (see [[~~Open Zipit~~]] / Applications / Freebase for example)	+	The Zipit is a fairly capable audio device. There are several applications that can play audio on the Zipit. [http://groups.yahoo.com/group/zipitwireless Yahoo! group.] has some of these in the files section (see [[OpenZipit]] / Applications / Freebase for example)

−	Thanks to [[Ken ~~Mc Guire]]~~, The [[ZipIt]]'s audio hardware is supported and you have access to a standard OSS-style audio device. This means that any application that works with /dev/dsp ''should'' work once compiled for the [[ZipIt]]. The Device names are a little different than what you may be used to by default. They are:	+	Thanks to Ken McGuire, The [[ZipIt]]'s audio hardware is supported and you have access to a standard OSS-style audio device. This means that any application that works with /dev/dsp ''should'' work once compiled for the [[ZipIt]]. The Device names are a little different than what you may be used to by default. They are:

← Older revision		Revision as of 10:29, 14 July 2007
Line 31:		Line 31:

	Similar functionality has been developed on [[OpenZipIt]] by [[Jay Kuri]] allowing users to stream any audio from their Linux desktop to their [[ZipIt]]. (note: add link to setup instructions)		Similar functionality has been developed on [[OpenZipIt]] by [[Jay Kuri]] allowing users to stream any audio from their Linux desktop to their [[ZipIt]]. (note: add link to setup instructions)
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		+	[[Category:Zipit]]