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authorRostislav Pehlivanov <atomnuker@gmail.com>2015-12-06 13:34:33 +0000
committerRostislav Pehlivanov <atomnuker@gmail.com>2015-12-06 20:16:48 +0000
commitd55f83de4d419d22d2fd2c0b9ff4ce6bf93847d6 (patch)
tree245386d955cfcffb14c5c54b217e799013a31175 /libavformat
parentb32e989e6c65ec9ec206ad938a1decdf2e0da07b (diff)
downloadffmpeg-d55f83de4d419d22d2fd2c0b9ff4ce6bf93847d6.tar.gz
aacenc_tns: tune and reduce artifacts
There are a couple of major changes here: 1. Start using TNS coefficient compression. 2. Start using 3 bits per coefficient maximum for short windows. The bits we save from these 2 changes seem to make a nice impact on the rest of the file/windows. 3. Remove special case gain checking for short windows. 4. Modify the coefficient loop to support up to 3 windows. The additional restrictions on TNS were something that was no in the specifications and furthermore restricting TNS to only low energy short windows was done to compensate for bugs elsewhere in the code. Overall, the improvements here reduce crackling artifacts heard in very noisy tracks. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
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