[speex-dev] auto-detection of frame boundary
jean-marc.valin at hermes.usherb.ca
Mon May 12 11:52:13 PDT 2003
Le lun 12/05/2003 à 14:27, Tongbiao Li a écrit :
> I tried feeding in the 3 encoded frame in ONE BLOCK, and calling speex_decode() 3 times in a roll. Only the 1st frames came out perfectly. For the other 2, I got "corrupt" frame warning.
> I was supposed to get 38 bytes consumed each frame (narrow-band, VBR off). I tried speex_bits_remaining() to peek on the # of bits consumed, and got variable (clearly wrong)#s returned.
> But if I used length-prefix, and having it read in each frame separately before calling speex_decode() on each, the frames came out OK. So the frames were encoded OK, and only the way I called on the decoding side had problems.
> The question is: do I need to let the decoder read in each frame separately and speex_decode() on each? Note, for VBR, I have to transfer frame size for EACH frame, which is not as desirable.
It probably means that something's wrong with your code. It should look
speex_encode(enc, frame1, &bits);
speex_encode(enc, frame2, &bits);
speex_encode(enc, frame3, &bits);
peex_decode(dec, &bits, frame1);
speex_decode(dec, &bits, frame2);
speex_decode(dec, &bits, frame3);
See speexenc.c and speexdec.c for more details (--nframes option).
Jean-Marc Valin, M.Sc.A.
Université de Sherbrooke, Québec, Canada
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