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libspeexenc: Updated commentary to reflect recent changes

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Signed-off-by: Martin Storsjö <martin@martin.st>
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Dmitry Samonenko 2012-10-05 00:42:31 +04:00 committed by Martin Storsjö
parent 978d5bd2a7
commit f1c6a740fc
1 changed files with 17 additions and 0 deletions
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libavcodec/libspeexenc.c
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@ -62,6 +62,23 @@
* sometimes desirable to use multiple frames-per-packet to reduce the
* amount of container overhead. This can be done by setting the
* 'frames_per_packet' option to a value 1 to 8.
*
*
* Optional features
* Speex encoder supports several optional features, which can be useful
* for some conditions.
*
* Voice Activity Detection
* When enabled, voice activity detection detects whether the audio
* being encoded is speech or silence/background noise. VAD is always
* implicitly activated when encoding in VBR, so the option is only useful
* in non-VBR operation. In this case, Speex detects non-speech periods and
* encodes them with just enough bits to reproduce the background noise.
*
* Discontinuous Transmission (DTX)
* DTX is an addition to VAD/VBR operation, that allows to stop transmitting
* completely when the background noise is stationary.
* In file-based operation only 5 bits are used for such frames.
*/
#include <speex/speex.h>