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Diffstat (limited to '')
-rw-r--r-- | third_party/libwebrtc/modules/audio_coding/codecs/ilbc/simple_lsf_quant.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/simple_lsf_quant.c b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/simple_lsf_quant.c new file mode 100644 index 0000000000..1291d1442e --- /dev/null +++ b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/simple_lsf_quant.c @@ -0,0 +1,49 @@ +/* + * 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_SimpleLsfQ.c + +******************************************************************/ + +#include "modules/audio_coding/codecs/ilbc/simple_lsf_quant.h" + +#include "modules/audio_coding/codecs/ilbc/constants.h" +#include "modules/audio_coding/codecs/ilbc/defines.h" +#include "modules/audio_coding/codecs/ilbc/split_vq.h" + +/*----------------------------------------------------------------* + * lsf quantizer (subrutine to LPCencode) + *---------------------------------------------------------------*/ + +void WebRtcIlbcfix_SimpleLsfQ( + int16_t *lsfdeq, /* (o) dequantized lsf coefficients + (dimension FILTERORDER) Q13 */ + int16_t *index, /* (o) quantization index */ + int16_t *lsf, /* (i) the lsf coefficient vector to be + quantized (dimension FILTERORDER) Q13 */ + int16_t lpc_n /* (i) number of lsf sets to quantize */ + ){ + + /* Quantize first LSF with memoryless split VQ */ + WebRtcIlbcfix_SplitVq( lsfdeq, index, lsf, + (int16_t*)WebRtcIlbcfix_kLsfCb, (int16_t*)WebRtcIlbcfix_kLsfDimCb, (int16_t*)WebRtcIlbcfix_kLsfSizeCb); + + if (lpc_n==2) { + /* Quantize second LSF with memoryless split VQ */ + WebRtcIlbcfix_SplitVq( lsfdeq + LPC_FILTERORDER, index + LSF_NSPLIT, + lsf + LPC_FILTERORDER, (int16_t*)WebRtcIlbcfix_kLsfCb, + (int16_t*)WebRtcIlbcfix_kLsfDimCb, (int16_t*)WebRtcIlbcfix_kLsfSizeCb); + } + return; +} |