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${ noResults }
9 Commits (b966a403dd80604bb7dbb9ee6ec331ade0e84953)
Author | SHA1 | Message | Date |
---|---|---|---|
Rostislav Pehlivanov | 4c5136a48b |
aacenc_ltp: disable LTP with high lambda values
Makes no sense to enable for high bitrates, the coder does well enough. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com> |
9 years ago |
Rostislav Pehlivanov | ed08cbd7b1 |
aacenc_ltp: fix out of bounds memory access
Discovered by Coverity. |
9 years ago |
Rostislav Pehlivanov | f5b7a29ae8 |
aac_ltp: actually signal LTP as off during EIGHT_SHORT windows
This hugely reduces the echo which was introduced with the previous commit (though likely because previously everything was broken). Makes LTP actually worthwhile now. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com> |
9 years ago |
Rostislav Pehlivanov | 1e5dbb3409 |
aac_ltp: split, reorder and improve prediction algorithm
This commit attempts to mirror what the decoder does more closely in addition to fixing some shortcomings. |
9 years ago |
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. |
9 years ago |
Rostislav Pehlivanov | 4c9805538d |
aacenc_ltp: correct header description comment
|
9 years ago |
Rostislav Pehlivanov | b0a3c614b4 |
aacenc_ltp: replace av_clip() with av_clip_uintp2()
Suggested by ubitux. Convenient. |
9 years ago |
Rostislav Pehlivanov | 780dba01f9 |
aacenc_ltp: fix assertion
A value of 2048 will overflow 11 bits. |
9 years ago |
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. |
9 years ago |