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common_audio: Made input vector const in WebRtcSpl_LevinsonDurbin()

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In addition, expanded the unit test to verify both unstable and stable filters.

BUG=3353, 1132
TESTED=locally on Mac and trybots
R=kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/35599004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8038 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
bjornv@webrtc.org
2015-01-12 05:53:43 +00:00
parent c14e3572c6
commit 88a4298234
3 changed files with 19 additions and 19 deletions
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12
webrtc/common_audio/signal_processing/include/signal_processing_library.h
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@ -456,17 +456,15 @@ int WebRtcSpl_AutoCorrelation(const int16_t* in_vector,
// does NOT use the 64 bit class
//
// Input:
// - auto_corr : Vector with autocorrelation values of length >=
// |use_order|+1
// - use_order : The LPC filter order (support up to order 20)
// - auto_corr : Vector with autocorrelation values of length >= |order|+1
// - order : The LPC filter order (support up to order 20)
//
// Output:
// - lpc_coef : lpc_coef[0..use_order] LPC coefficients in Q12
// - refl_coef : refl_coef[0...use_order-1]| Reflection coefficients in
// Q15
// - lpc_coef : lpc_coef[0..order] LPC coefficients in Q12
// - refl_coef : refl_coef[0...order-1]| Reflection coefficients in Q15
//
// Return value : 1 for stable 0 for unstable
int16_t WebRtcSpl_LevinsonDurbin(int32_t* auto_corr,
int16_t WebRtcSpl_LevinsonDurbin(const int32_t* auto_corr,
int16_t* lpc_coef,
int16_t* refl_coef,
int16_t order);