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| author | Dmitry Samonenko <shreddingwork@gmail.com> | 2012-10-05 00:42:31 +0400 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-10-05 00:17:38 +0200 |
| commit | 66a4ac5182777ef0ade673c89a4766909ac9d00c (patch) | |
| tree | 10eb34818b28cf577fcc7598033fb7cac41ff06a /libavcodec/libspeexenc.c | |
| parent | 038325ac05ff4a7fc2e91d6f831cad50c0e50dc2 (diff) | |
| download | ffmpeg-66a4ac5182777ef0ade673c89a4766909ac9d00c.tar.gz | |
libspeexenc: Updated commentary to reflect recent changes
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/libspeexenc.c')
| -rw-r--r-- | libavcodec/libspeexenc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libavcodec/libspeexenc.c b/libavcodec/libspeexenc.c index 97a2ea5285..e3db143f75 100644 --- a/libavcodec/libspeexenc.c +++ b/libavcodec/libspeexenc.c @@ -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> |