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Diffstat (limited to '')
-rw-r--r-- | third_party/libwebrtc/modules/audio_coding/codecs/ilbc/lsf_interpolate_to_poly_enc.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/lsf_interpolate_to_poly_enc.c b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/lsf_interpolate_to_poly_enc.c new file mode 100644 index 0000000000..618821216c --- /dev/null +++ b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/lsf_interpolate_to_poly_enc.c @@ -0,0 +1,48 @@ +/* + * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +/****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + WebRtcIlbcfix_LsfInterpolate2PloyEnc.c + +******************************************************************/ + +#include "modules/audio_coding/codecs/ilbc/lsf_interpolate_to_poly_enc.h" + +#include "modules/audio_coding/codecs/ilbc/defines.h" +#include "modules/audio_coding/codecs/ilbc/interpolate.h" +#include "modules/audio_coding/codecs/ilbc/lsf_to_poly.h" + +/*----------------------------------------------------------------* + * lsf interpolator and conversion from lsf to a coefficients + * (subrutine to SimpleInterpolateLSF) + *---------------------------------------------------------------*/ + +void WebRtcIlbcfix_LsfInterpolate2PloyEnc( + int16_t *a, /* (o) lpc coefficients Q12 */ + int16_t *lsf1, /* (i) first set of lsf coefficients Q13 */ + int16_t *lsf2, /* (i) second set of lsf coefficients Q13 */ + int16_t coef, /* (i) weighting coefficient to use between + lsf1 and lsf2 Q14 */ + int16_t length /* (i) length of coefficient vectors */ + ) { + /* Stack based */ + int16_t lsftmp[LPC_FILTERORDER]; + + /* interpolate LSF */ + WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length); + + /* Compute the filter coefficients from the LSF */ + WebRtcIlbcfix_Lsf2Poly(a, lsftmp); + + return; +} |