Speex dev - Sep 2007 - Need some clarifications about "speex_preprocess_run"

Simple questions:1. when this method is called for each frame, do I have to call
them twice for both the encode process and the decode process?2. does
preprocessor do preprocessing on raw PCM data or on encoded speex data? I need
to clarify this because i want to know when should I call this function, before
the encoding process (i.e. preprocess the pcm data) or after the encoding
process (i.e. the speex data)3. and if my questions is still not well
understood, here is the encoding snippet and decoding snippet I have, which line
should I insert "speex_preprocess_run", assume init and destroy are
handled properly?encode part.
.
.speex_bits_reset(&bits);speex_encode_int(encoder, (spx_int16_t* )bytes,
&bits);count = speex_bits_write(&bits, bytes, len);.
.
.decode part.
.
.speex_bits_read_from(&bits2, bytes, enc_count);speex_decode_int(decoder,
&bits2, bytes);.
.
.Thanks in advanceHAI YUN TAO
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If you want to use the preprocessor (it's not required), then you need
to run it on the audio before encoding.

	Jean-Marc

Hai Yun Tao wrote:
> Simple questions:1. when this method is called for each frame, do I have to
call them twice for both the encode process and the decode process?2. does
preprocessor do preprocessing on raw PCM data or on encoded speex data? I need
to clarify this because i want to know when should I call this function, before
the encoding process (i.e. preprocess the pcm data) or after the encoding
process (i.e. the speex data)3. and if my questions is still not well
understood, here is the encoding snippet and decoding snippet I have, which line
should I insert "speex_preprocess_run", assume init and destroy are
handled properly?encode part.
> .
> .speex_bits_reset(&bits);speex_encode_int(encoder, (spx_int16_t*
)bytes, &bits);count = speex_bits_write(&bits, bytes, len);.
> .
> .decode part.
> .
> .speex_bits_read_from(&bits2, bytes,
enc_count);speex_decode_int(decoder, &bits2, bytes);.
> .
> .Thanks in advanceHAI YUN TAO
> _________________________________________________________________
> Connect to the next generation of MSN Messenger 
>
http://imagine-msn.com/messenger/launch80/default.aspx?locale=en-us&source=wlmailtagline
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