Index: speex/libspeex/ltp.h |
=================================================================== |
--- speex/libspeex/ltp.h (revision 0) |
+++ speex/libspeex/ltp.h (revision 0) |
@@ -0,0 +1,141 @@ |
+/* Copyright (C) 2002 Jean-Marc Valin */ |
+/** |
+ @file ltp.h |
+ @brief Long-Term Prediction functions |
+*/ |
+/* |
+ Redistribution and use in source and binary forms, with or without |
+ modification, are permitted provided that the following conditions |
+ are met: |
+ |
+ - Redistributions of source code must retain the above copyright |
+ notice, this list of conditions and the following disclaimer. |
+ |
+ - Redistributions in binary form must reproduce the above copyright |
+ notice, this list of conditions and the following disclaimer in the |
+ documentation and/or other materials provided with the distribution. |
+ |
+ - Neither the name of the Xiph.org Foundation nor the names of its |
+ contributors may be used to endorse or promote products derived from |
+ this software without specific prior written permission. |
+ |
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
+ CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+*/ |
+ |
+#include <speex/speex_bits.h> |
+#include "arch.h" |
+ |
+/** LTP parameters. */ |
+typedef struct { |
+ const signed char *gain_cdbk; |
+ int gain_bits; |
+ int pitch_bits; |
+} ltp_params; |
+ |
+#ifdef FIXED_POINT |
+#define gain_3tap_to_1tap(g) (ABS(g[1]) + (g[0]>0 ? g[0] : -SHR16(g[0],1)) + (g[2]>0 ? g[2] : -SHR16(g[2],1))) |
+#else |
+#define gain_3tap_to_1tap(g) (ABS(g[1]) + (g[0]>0 ? g[0] : -.5*g[0]) + (g[2]>0 ? g[2] : -.5*g[2])) |
+#endif |
+ |
+spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len); |
+void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack); |
+ |
+void open_loop_nbest_pitch(spx_word16_t *sw, int start, int end, int len, int *pitch, spx_word16_t *gain, int N, char *stack); |
+ |
+ |
+/** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */ |
+int pitch_search_3tap( |
+spx_word16_t target[], /* Target vector */ |
+spx_word16_t *sw, |
+spx_coef_t ak[], /* LPCs for this subframe */ |
+spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
+spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
+spx_sig_t exc[], /* Overlapping codebook */ |
+const void *par, |
+int start, /* Smallest pitch value allowed */ |
+int end, /* Largest pitch value allowed */ |
+spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
+int p, /* Number of LPC coeffs */ |
+int nsf, /* Number of samples in subframe */ |
+SpeexBits *bits, |
+char *stack, |
+spx_word16_t *exc2, |
+spx_word16_t *r, |
+int complexity, |
+int cdbk_offset, |
+int plc_tuning, |
+spx_word32_t *cumul_gain |
+); |
+ |
+/*Unquantize adaptive codebook and update pitch contribution*/ |
+void pitch_unquant_3tap( |
+spx_word16_t exc[], /* Input excitation */ |
+spx_word32_t exc_out[], /* Output excitation */ |
+int start, /* Smallest pitch value allowed */ |
+int end, /* Largest pitch value allowed */ |
+spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
+const void *par, |
+int nsf, /* Number of samples in subframe */ |
+int *pitch_val, |
+spx_word16_t *gain_val, |
+SpeexBits *bits, |
+char *stack, |
+int lost, |
+int subframe_offset, |
+spx_word16_t last_pitch_gain, |
+int cdbk_offset |
+); |
+ |
+/** Forced pitch delay and gain */ |
+int forced_pitch_quant( |
+spx_word16_t target[], /* Target vector */ |
+spx_word16_t *sw, |
+spx_coef_t ak[], /* LPCs for this subframe */ |
+spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
+spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
+spx_sig_t exc[], /* Excitation */ |
+const void *par, |
+int start, /* Smallest pitch value allowed */ |
+int end, /* Largest pitch value allowed */ |
+spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
+int p, /* Number of LPC coeffs */ |
+int nsf, /* Number of samples in subframe */ |
+SpeexBits *bits, |
+char *stack, |
+spx_word16_t *exc2, |
+spx_word16_t *r, |
+int complexity, |
+int cdbk_offset, |
+int plc_tuning, |
+spx_word32_t *cumul_gain |
+); |
+ |
+/** Unquantize forced pitch delay and gain */ |
+void forced_pitch_unquant( |
+spx_word16_t exc[], /* Input excitation */ |
+spx_word32_t exc_out[], /* Output excitation */ |
+int start, /* Smallest pitch value allowed */ |
+int end, /* Largest pitch value allowed */ |
+spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
+const void *par, |
+int nsf, /* Number of samples in subframe */ |
+int *pitch_val, |
+spx_word16_t *gain_val, |
+SpeexBits *bits, |
+char *stack, |
+int lost, |
+int subframe_offset, |
+spx_word16_t last_pitch_gain, |
+int cdbk_offset |
+); |
Property changes on: speex/libspeex/ltp.h |
___________________________________________________________________ |
Name: svn:executable |
+ * |