Commit Graph

5 Commits

Author SHA1 Message Date
Rostislav Pehlivanov
7303962f14 aacenc_ltp: adjust and speed up autocorrelation calculations
There were some errors in the calculation as well as an entire
unnecessary loop to find the gain coefficient. Merge the
two loops.
Thanks to @ubitux for the suggestions and testing.
2015-10-17 22:53:11 +01:00
Rostislav Pehlivanov
4c9805538d aacenc_ltp: correct header description comment 2015-10-17 13:28:55 +01:00
Rostislav Pehlivanov
b0a3c614b4 aacenc_ltp: replace av_clip() with av_clip_uintp2()
Suggested by ubitux.
Convenient.
2015-10-17 12:24:16 +01:00
Rostislav Pehlivanov
780dba01f9 aacenc_ltp: fix assertion
A value of 2048 will overflow 11 bits.
2015-10-17 12:00:30 +01:00
Rostislav Pehlivanov
27d23ae074 aacenc: add support for encoding files using Long Term Prediction
Long Term Prediction allows for prediction of spectral coefficients
via the previously decoded time-dependent samples. This feature
works well with harmonic content 2 or more frames long, like speech,
human or non-human, piano music or any constant tones at very low
bitrates.

It should be noted that the current coder is highly efficient and
the rate control system is unable to encode files at extremely
low bitrates (less than 14kbps seems to be impossible) so this
extension isn't capable of optimum operation. Dramatic difference
is observable with some types of audio and speech but for the most
part the audiable differences are subtle. The spectrum looks better
however so the encoder is able to harvest the additional bits that
this feature provies, should the user choose to enable it. So
it's best to enable this feature only if encoding at the absolutely
lowest bitrate that the encoder is capable of.
2015-10-17 02:31:20 +01:00