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-rw-r--r--drivers/speex/vbr.c275
1 files changed, 0 insertions, 275 deletions
diff --git a/drivers/speex/vbr.c b/drivers/speex/vbr.c
deleted file mode 100644
index 16100e3d41..0000000000
--- a/drivers/speex/vbr.c
+++ /dev/null
@@ -1,275 +0,0 @@
-/* Copyright (C) 2002 Jean-Marc Valin
- File: vbr.c
-
- VBR-related routines
-
- 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 "config.h"
-
-
-#include "vbr.h"
-#include <math.h>
-
-
-#define sqr(x) ((x)*(x))
-
-#define MIN_ENERGY 6000
-#define NOISE_POW .3
-
-#ifndef DISABLE_VBR
-
-const float vbr_nb_thresh[9][11]={
- {-1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f}, /* CNG */
- { 4.0f, 2.5f, 2.0f, 1.2f, 0.5f, 0.0f, -0.5f, -0.7f, -0.8f, -0.9f, -1.0f}, /* 2 kbps */
- {10.0f, 6.5f, 5.2f, 4.5f, 3.9f, 3.5f, 3.0f, 2.5f, 2.3f, 1.8f, 1.0f}, /* 6 kbps */
- {11.0f, 8.8f, 7.5f, 6.5f, 5.0f, 3.9f, 3.9f, 3.9f, 3.5f, 3.0f, 1.0f}, /* 8 kbps */
- {11.0f, 11.0f, 9.9f, 8.5f, 7.0f, 6.0f, 4.5f, 4.0f, 4.0f, 4.0f, 2.0f}, /* 11 kbps */
- {11.0f, 11.0f, 11.0f, 11.0f, 9.5f, 8.5f, 8.0f, 7.0f, 6.0f, 5.0f, 3.0f}, /* 15 kbps */
- {11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 9.5f, 8.5f, 7.0f, 6.0f, 5.0f}, /* 18 kbps */
- {11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 9.8f, 9.5f, 7.5f}, /* 24 kbps */
- { 7.0f, 4.5f, 3.7f, 3.0f, 2.5f, 2.0f, 1.8f, 1.5f, 1.0f, 0.0f, 0.0f} /* 4 kbps */
-};
-
-
-const float vbr_hb_thresh[5][11]={
- {-1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f}, /* silence */
- {-1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f}, /* 2 kbps */
- {11.0f, 11.0f, 9.5f, 8.5f, 7.5f, 6.0f, 5.0f, 3.9f, 3.0f, 2.0f, 1.0f}, /* 6 kbps */
- {11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 9.5f, 8.7f, 7.8f, 7.0f, 6.5f, 4.0f}, /* 10 kbps */
- {11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 11.0f, 9.8f, 7.5f, 5.5f} /* 18 kbps */
-};
-
-const float vbr_uhb_thresh[2][11]={
- {-1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f}, /* silence */
- { 3.9f, 2.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -1.0f} /* 2 kbps */
-};
-
-void vbr_init(VBRState *vbr)
-{
- int i;
-
- vbr->average_energy=0;
- vbr->last_energy=1;
- vbr->accum_sum=0;
- vbr->energy_alpha=.1;
- vbr->soft_pitch=0;
- vbr->last_pitch_coef=0;
- vbr->last_quality=0;
-
- vbr->noise_accum = .05*pow(MIN_ENERGY, NOISE_POW);
- vbr->noise_accum_count=.05;
- vbr->noise_level=vbr->noise_accum/vbr->noise_accum_count;
- vbr->consec_noise=0;
-
-
- for (i=0;i<VBR_MEMORY_SIZE;i++)
- vbr->last_log_energy[i] = log(MIN_ENERGY);
-}
-
-
-/*
- This function should analyse the signal and decide how critical the
- coding error will be perceptually. The following factors should be
- taken into account:
-
- -Attacks (positive energy derivative) should be coded with more bits
-
- -Stationary voiced segments should receive more bits
-
- -Segments with (very) low absolute energy should receive less bits (maybe
- only shaped noise?)
-
- -DTX for near-zero energy?
-
- -Stationary fricative segments should have less bits
-
- -Temporal masking: when energy slope is decreasing, decrease the bit-rate
-
- -Decrease bit-rate for males (low pitch)?
-
- -(wideband only) less bits in the high-band when signal is very
- non-stationary (harder to notice high-frequency noise)???
-
-*/
-
-float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef)
-{
- int i;
- float ener=0, ener1=0, ener2=0;
- float qual=7;
- int va;
- float log_energy;
- float non_st=0;
- float voicing;
- float pow_ener;
-
- for (i=0;i<len>>1;i++)
- ener1 += ((float)sig[i])*sig[i];
-
- for (i=len>>1;i<len;i++)
- ener2 += ((float)sig[i])*sig[i];
- ener=ener1+ener2;
-
- log_energy = log(ener+MIN_ENERGY);
- for (i=0;i<VBR_MEMORY_SIZE;i++)
- non_st += sqr(log_energy-vbr->last_log_energy[i]);
- non_st = non_st/(30*VBR_MEMORY_SIZE);
- if (non_st>1)
- non_st=1;
-
- voicing = 3*(pitch_coef-.4)*fabs(pitch_coef-.4);
- vbr->average_energy = (1-vbr->energy_alpha)*vbr->average_energy + vbr->energy_alpha*ener;
- vbr->noise_level=vbr->noise_accum/vbr->noise_accum_count;
- pow_ener = pow(ener,NOISE_POW);
- if (vbr->noise_accum_count<.06 && ener>MIN_ENERGY)
- vbr->noise_accum = .05*pow_ener;
-
- if ((voicing<.3 && non_st < .2 && pow_ener < 1.2*vbr->noise_level)
- || (voicing<.3 && non_st < .05 && pow_ener < 1.5*vbr->noise_level)
- || (voicing<.4 && non_st < .05 && pow_ener < 1.2*vbr->noise_level)
- || (voicing<0 && non_st < .05))
- {
- float tmp;
- va = 0;
- vbr->consec_noise++;
- if (pow_ener > 3*vbr->noise_level)
- tmp = 3*vbr->noise_level;
- else
- tmp = pow_ener;
- if (vbr->consec_noise>=4)
- {
- vbr->noise_accum = .95*vbr->noise_accum + .05*tmp;
- vbr->noise_accum_count = .95*vbr->noise_accum_count + .05;
- }
- } else {
- va = 1;
- vbr->consec_noise=0;
- }
-
- if (pow_ener < vbr->noise_level && ener>MIN_ENERGY)
- {
- vbr->noise_accum = .95*vbr->noise_accum + .05*pow_ener;
- vbr->noise_accum_count = .95*vbr->noise_accum_count + .05;
- }
-
- /* Checking for very low absolute energy */
- if (ener < 30000)
- {
- qual -= .7;
- if (ener < 10000)
- qual-=.7;
- if (ener < 3000)
- qual-=.7;
- } else {
- float short_diff, long_diff;
- short_diff = log((ener+1)/(1+vbr->last_energy));
- long_diff = log((ener+1)/(1+vbr->average_energy));
- /*fprintf (stderr, "%f %f\n", short_diff, long_diff);*/
-
- if (long_diff<-5)
- long_diff=-5;
- if (long_diff>2)
- long_diff=2;
-
- if (long_diff>0)
- qual += .6*long_diff;
- if (long_diff<0)
- qual += .5*long_diff;
- if (short_diff>0)
- {
- if (short_diff>5)
- short_diff=5;
- qual += .5*short_diff;
- }
- /* Checking for energy increases */
- if (ener2 > 1.6*ener1)
- qual += .5;
- }
- vbr->last_energy = ener;
- vbr->soft_pitch = .6*vbr->soft_pitch + .4*pitch_coef;
- qual += 2.2*((pitch_coef-.4) + (vbr->soft_pitch-.4));
-
- if (qual < vbr->last_quality)
- qual = .5*qual + .5*vbr->last_quality;
- if (qual<4)
- qual=4;
- if (qual>10)
- qual=10;
-
- /*
- if (vbr->consec_noise>=2)
- qual-=1.3;
- if (vbr->consec_noise>=5)
- qual-=1.3;
- if (vbr->consec_noise>=12)
- qual-=1.3;
- */
- if (vbr->consec_noise>=3)
- qual=4;
-
- if (vbr->consec_noise)
- qual -= 1.0 * (log(3.0 + vbr->consec_noise)-log(3));
- if (qual<0)
- qual=0;
-
- if (ener<60000)
- {
- if (vbr->consec_noise>2)
- qual-=0.5*(log(3.0 + vbr->consec_noise)-log(3));
- if (ener<10000&&vbr->consec_noise>2)
- qual-=0.5*(log(3.0 + vbr->consec_noise)-log(3));
- if (qual<0)
- qual=0;
- qual += .3*log(.0001+ener/60000.0);
- }
- if (qual<-1)
- qual=-1;
-
- /*printf ("%f %f %f %f %d\n", qual, voicing, non_st, pow_ener/(.01+vbr->noise_level), va);*/
-
- vbr->last_pitch_coef = pitch_coef;
- vbr->last_quality = qual;
-
- for (i=VBR_MEMORY_SIZE-1;i>0;i--)
- vbr->last_log_energy[i] = vbr->last_log_energy[i-1];
- vbr->last_log_energy[0] = log_energy;
-
- /*printf ("VBR: %f %f %f %d %f\n", (float)(log_energy-log(vbr->average_energy+MIN_ENERGY)), non_st, voicing, va, vbr->noise_level);*/
-
- return qual;
-}
-
-void vbr_destroy(VBRState *vbr)
-{
-}
-
-#endif /* #ifndef DISABLE_VBR */
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