[speex-dev] Where to pause stream (minimum decodable length)?
robert.m at ib-caddy.si
Fri May 16 11:09:23 PDT 2003
Thanks Jean-Marc. I'll take this as a fact. I guess I was confused by
the equation in your code:
bit_rate = st->sampling_rate*SUBMODE(bits_per_frame)/st->frameSize
by the parameter SUBMODE(bits_per_frame).
Jean-Marc Valin wrote:
>Yes it's the minimum, as you can't decode half a frame. In Speex frames
>are 20ms which should be low enough anyway.
>Le ven 16/05/2003 à 04:03, Robert M. a écrit :
>>Here is my situation:
>>I have large Speex encoded stream which I would like to playback on wave
>>out device. I could decode whole stream to pcm and play it back as pcm
>>audio, but this is not what I want. Instead I want to decode minimum
>>decodable bits (bytes?) to pcm and play it ... then decode another
>>minimum data chunk and play it, etc. This way I can achieve closest to
>>real-time playback or I can pause and then restart playback. So, my
>>question is: What is minimum length of Speex encoded data where decoder
>>(speex_decode) will still successfully decode input data? In Windows
>>terminology this is called BlockAlign. The block alignment is the
>>minimum atomic unit of data the playback and record software must
>>process at a time .
>>BTW, the sample provided is using frame_size*channels but I don't think
>>this is the minimum.
>>P.S. I need this for my ACM codec driver I'm working on.
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Lep pozdrav / Best regards
ib-CADdy d.o.o. / www.ib-caddy.si
Tel.: +386 1 566 12 55
Fax.: +386 1 568 22 25
e-mail: robert.milharcic at ib-caddy.si
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