fenix/fdk-aac
1
0
Fork 0
mirror of https://github.com/mstorsjo/fdk-aac.git synced 2025-02-03 17:27:51 +01:00
Code Issues Projects Releases Wiki Activity

Enhance TNS tuning for 8 kHz audio sampling rate

Browse Source 
This tuning has been suggested by Fraunhofer, fixing overflows
in encoding certain sequences.
This commit is contained in:
Martin Storsjo 2017-08-18 22:33:37 +03:00
parent 1244b257ee
commit 963b189156
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libAACenc/src/aacenc_tns.cpp
View File

@ -388,7 +388,7 @@ AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitRate,
switch (granuleLength) {
case 1024:
/* TNS start line: skip lower MDCT lines to prevent artifacts due to filter mismatch */
tC->lpcStartBand[LOFILT] = (blockType == SHORT_WINDOW) ? 0 : ((sampleRate < 18783) ? 4 : 8);
tC->lpcStartBand[LOFILT] = (blockType == SHORT_WINDOW) ? 0 : ((sampleRate <= 8000) ? 2 : ((sampleRate < 18783) ? 4 : 8));
tC->lpcStartLine[LOFILT] = pC->sfbOffset[tC->lpcStartBand[LOFILT]];
i = tC->lpcStopBand;