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author | jm <jm@0101bb08-14d6-0310-b084-bc0e0c8e3800> | 2008-05-22 03:44:56 +0400 |
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committer | jm <jm@0101bb08-14d6-0310-b084-bc0e0c8e3800> | 2008-05-22 03:44:56 +0400 |
commit | d850199c6057f245a6f103965767893bf2070e32 (patch) | |
tree | bc72fc2af7845d9c4aed8bedb86734177d2a6a09 /doc/manual.lyx | |
parent | 503545cb74d30783e008eb7754e5933f98047aea (diff) |
Adding "listing" tags in manual
git-svn-id: http://svn.xiph.org/trunk/speex@14935 0101bb08-14d6-0310-b084-bc0e0c8e3800
Diffstat (limited to 'doc/manual.lyx')
-rw-r--r-- | doc/manual.lyx | 207 |
1 files changed, 187 insertions, 20 deletions
diff --git a/doc/manual.lyx b/doc/manual.lyx index 0e23e3d..b801cbd 100644 --- a/doc/manual.lyx +++ b/doc/manual.lyx @@ -4556,7 +4556,11 @@ sees \end_layout \begin_layout Itemize -When it comes to echo tail length (filter length), longer is *not* better. +When it comes to echo tail length (filter length), longer is +\series bold +not +\series default + better. Actually, the longer the tail length, the longer it takes for the filter to adapt. Of course, a tail length that is too short will not cancel enough echo, @@ -4964,10 +4968,56 @@ resampler = speex_resampler_init(nb_channels, input_rate, output_rate, quality, \end_layout \begin_layout Standard -where nb_channels is the number of channels that will be used (either interleave -d or non-interleaved), input_rate is the sampling rate of the input stream, - output_rate is the sampling rate of the output stream and quality is the - requested quality setting (0 to 10). +where +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + +nb_channels +\end_layout + +\end_inset + + is the number of channels that will be used (either interleaved or non-interlea +ved), +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + +input_rate +\end_layout + +\end_inset + + is the sampling rate of the input stream, +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + +output_rate +\end_layout + +\end_inset + + is the sampling rate of the output stream and +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + +quality +\end_layout + +\end_inset + + is the requested quality setting (0 to 10). The quality parameter is useful for controlling the quality/complexity/latency tradeoff. Using a higher quality setting means less noise/aliasing, a higher complexity @@ -4995,7 +5045,19 @@ err = speex_resampler_process_int(resampler, channelID, in, &in_length, \end_inset -where channelID is the ID of the channel to be processed. +where +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + +channelID +\end_layout + +\end_inset + + is the ID of the channel to be processed. For a mono stream, use 0. The \emph on @@ -5003,32 +5065,90 @@ in \emph default pointer points to the first sample of the input buffer for the selected channel and -\emph on +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + out -\emph default +\end_layout + +\end_inset + points to the first sample of the output. The size of the input and output buffers are specified by -\emph on +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + in_length -\emph default +\end_layout + +\end_inset + and -\emph on +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + out_length -\emph default +\end_layout + +\end_inset + respectively. Upon completion, these values are replaced by the number of samples read and written by the resampler. Unless an error occurs, either all input samples will be read or all output samples will be written to (or both). - For floating-point samples, the function speex_resampler_process_float() + For floating-point samples, the function +\begin_inset listings +inline true +status open + +\begin_layout Standard + +speex_resampler_process_float() +\end_layout + +\end_inset + behaves similarly. \end_layout \begin_layout Standard It is also possible to process multiple channels at once. - To do that, you can use speex_resampler_process_interleaved_int() or speex_resa -mpler_process_interleaved_float(). - The arguments are the same except that there is no channelID argument. + To do that, you can use speex_resampler_process_interleaved_int() or +\begin_inset listings +inline true +status open + +\begin_layout Standard + +speex_resampler_process_interleaved_float() +\end_layout + +\end_inset + +. + The arguments are the same except that there is no +\begin_inset listings +inline true +status collapsed + +\begin_layout Standard + +channelID +\end_layout + +\end_inset + + argument. Note that the \series bold length parameters are per-channel @@ -5041,8 +5161,31 @@ length parameters are per-channel \begin_layout Standard The resampler allows changing the quality and input/output sampling frequencies on the fly without glitches. - This can be done with calls such as speex_resampler_set_quality() and speex_res -ampler_set_rate(). + This can be done with calls such as +\begin_inset listings +inline true +status open + +\begin_layout Standard + +speex_resampler_set_quality() +\end_layout + +\end_inset + + and +\begin_inset listings +inline true +status open + +\begin_layout Standard + +speex_resampler_set_rate() +\end_layout + +\end_inset + +. The only side effect is that a new filter will have to be recomputed, consuming many CPU cycles. @@ -5051,7 +5194,19 @@ ampler_set_rate(). \begin_layout Standard When resampling a file, it is often desirable to have the output file perfectly synchronised with the input. - To do that, you need to call speex_resampler_skip_zeros() + To do that, you need to call +\begin_inset listings +inline true +status open + +\begin_layout Standard + +speex_resampler_skip_zeros() +\end_layout + +\end_inset + + \series bold before \series default @@ -5059,7 +5214,19 @@ before For real-time applications (e.g. VoIP), it is not recommended to do that as the first process frame will be shorter to compensate for the delay (the skipped zeros). - To destroy a resampler state, just call speex_resampler_destroy(). + To destroy a resampler state, just call +\begin_inset listings +inline true +status open + +\begin_layout Standard + +speex_resampler_destroy() +\end_layout + +\end_inset + +. \end_layout \begin_layout Section |