Difference between revisions of "Jack frame, period, buffer info"
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(Created page with "Date: Wed, 15 Aug 2007 19:33:02 +0200<BR> Subject: Re: [Jackit-devel] Meant of periods and frames<BR> To: firstname.lastname@example.org<BR> <PRE> On Wednesday 15 August...")
Latest revision as of 16:24, 12 March 2018
Date: Wed, 15 Aug 2007 19:33:02 +0200
Subject: Re: [Jackit-devel] Meant of periods and frames
On Wednesday 15 August 2007, zappa wrote: > Hi people, > i'm a new user of jack at all, i'm italian => i don't speak english... > > the question: > I don't understand what is the FRAMES/PERIOD and the PERIODS/BUFFER, > the definition in the man page of jackd is confused for me. > If possible i would want a theorist definition of it. > Example: > the sample rate is the frequency of sampling, the amount of samples take > > >from the input; > > frames/period and periods/buffer what is practically? > > Sorry for my english...I hope is understood my problem > > ciao A frame of audio means 1 sample per channel.. E.g. if you have a 6-channel signal and you process one frame of it you have processed one sample per channel, 6 samples in total.. frames/period means frames per processing cycle (e.g. if you have 64 frames/period, then the buffersize per channel is 64 samples) periods/buffer means how many periods are there [on windows a period is more often called a "buffer"]. But in a typical double buffer scheme you have e.g. two buffers combined into a single chunk of memory.. And in alsa speak, this combined buffer is the "buffer" and the individual chunks in the buffers are called periods [kinda, the terminology is a little squishy] So one period is the first half of the buffer and the other period is the second half of the buffer.. Flo