I'm trying to play some .wav files that I downloaded and for some reason I can't get them to play using readsf or sfplay from Zexy. I have some files that I previously created myself and they work fine but the ones I download aren't working. I just get noise. Any thoughts as to what I may be doing wrong? Thanks, Jim
jim ruxton wrote:
download aren't working. I just get noise.
sounds like a problem with endianess. (e.g.: the 2 bytes of a 16bit sample are swapped) this occurs when you try to play back files on a pc that have been created on a mac or vice versa. there should be an option to [readsf~] where you can specify which endianess should be used (it defaults to your machine's endianess) there is no such option with [sfplay], but you could use [swap~] to do a byte-swap manually -> this will only work if you haven't done anything to the data that is coming out of [sfplay] (e.g: no [*~])
mfg.asd.r IOhannes
Thanks IOhannes, I tried playing with endianess on a couple of files I downloaded but didn't have any luck. Is there a program that I can run a wav file through to get all it's info ie. sample size, endianess etc. I find it frustrating just trying different settings to get readsf~ to play a file I download. Does anyone know where I can find documentation that discusses readsf~ more comprehensively than the help file. Thanks. Jim
jim ruxton wrote:
download aren't working. I just get noise.
sounds like a problem with endianess. (e.g.: the 2 bytes of a 16bit sample are swapped) this occurs when you try to play back files on a pc that have been created on a mac or vice versa. there should be an option to [readsf~] where you can specify which endianess should be used (it defaults to your machine's endianess) there is no such option with [sfplay], but you could use [swap~] to do a byte-swap manually -> this will only work if you haven't done anything to the data that is coming out of [sfplay] (e.g: no [*~])
mfg.asd.r IOhannes
As far as I can make it out, 'wav' is actually an infinite number of soundfile formats, some of which are informally documented.
I've never heard that 'wav' files could be other than Intel-style endinanness (which is what Pd expects, regardless of what machine you're on.)
The only 'wav' files Pd knows about are 16-, 24-, or 32-bit "PCM" files; i.e., no "data reduction". the best test is to look at the size of the file; if it's more than 88200 times as many bytes as seconds you're probably OK; if less than that, you've got some data reduction and you'll have to go buy something (windows) or download mpg321 (linux) to fix it.
cheers Miller
On Wed, Jun 16, 2004 at 11:35:13AM -0400, jim ruxton wrote:
Thanks IOhannes, I tried playing with endianess on a couple of files I downloaded but didn't have any luck. Is there a program that I can run a wav file through to get all it's info ie. sample size, endianess etc. I find it frustrating just trying different settings to get readsf~ to play a file I download. Does anyone know where I can find documentation that discusses readsf~ more comprehensively than the help file. Thanks. Jim
jim ruxton wrote:
download aren't working. I just get noise.
sounds like a problem with endianess. (e.g.: the 2 bytes of a 16bit sample are swapped) this occurs when you try to play back files on a pc that have been created on a mac or vice versa. there should be an option to [readsf~] where you can specify which endianess should be used (it defaults to your machine's endianess) there is no such option with [sfplay], but you could use [swap~] to do a byte-swap manually -> this will only work if you haven't done anything to the data that is coming out of [sfplay] (e.g: no [*~])
mfg.asd.r IOhannes
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jim ruxton wrote:
Thanks IOhannes, I tried playing with endianess on a couple of files I downloaded but didn't have any luck. Is there a program that I can run a wav file through to get all it's info ie. sample size, endianess etc. I find it frustrating just trying different settings to get readsf~ to play a file I download. Does anyone know where I can find documentation that discusses readsf~ more comprehensively than the help file. Thanks.
what OS are you running? in linux, you can use sndfile-info to get most of what you need. or you could open them in rezound or snd and have alook, maybe even export them as something else.
also, did you try to explicitely set *all* flags for the soundfile with messages? alternately, did you try opening it as a raw file?
if you check the archives here for "writesf~", you'll find another thread about headers and messages that might give you some inspiration.
d.
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derek holzer -
IOhannes m zmoelnig -
jim ruxton -
Miller Puckette