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-rw-r--r--pjmedia/src/pjmedia/plc_steveu.c338
1 files changed, 0 insertions, 338 deletions
diff --git a/pjmedia/src/pjmedia/plc_steveu.c b/pjmedia/src/pjmedia/plc_steveu.c
deleted file mode 100644
index 3326b748..00000000
--- a/pjmedia/src/pjmedia/plc_steveu.c
+++ /dev/null
@@ -1,338 +0,0 @@
-/*
- * SpanDSP - a series of DSP components for telephony
- *
- * plc.c
- *
- * Written by Steve Underwood <steveu@coppice.org>
- *
- * Copyright (C) 2004 Steve Underwood
- *
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * This version may be optionally licenced under the GNU LGPL licence.
- * This version is disclaimed to DIGIUM for inclusion in the Asterisk project.
- */
-
-/*! \file */
-
-#include <pjmedia/types.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <limits.h>
-
-#include "plc_steveu.h"
-
-#if !defined(FALSE)
-#define FALSE 0
-#endif
-#if !defined(TRUE)
-#define TRUE (!FALSE)
-#endif
-
-#ifndef INT16_MAX
-#define INT16_MAX (32767)
-#endif
-
-#ifndef INT16_MIN
-#define INT16_MIN (-32767-1)
-#endif
-
-//#define PJ_HAS_RINT 1
-
-
-/* We do a straight line fade to zero volume in 50ms when we are filling in for missing data. */
-#define ATTENUATION_INCREMENT 0.0025 /* Attenuation per sample */
-
-#define ms_to_samples(t) (((t)*SAMPLE_RATE)/1000)
-
-
-#if defined(PJ_HAS_RINT) && PJ_HAS_RINT!=0
-#define RINT(d) rint(d)
-#else
-double RINT(double d)
-{
- double f = floor(d);
- double c = ceil(d);
-
- if (c-d > d-f)
- return f;
- else if (c-d < d-f)
- return c;
- else if (d >= 0) {
- if (f/2==f)
- return f;
- else
- return c;
- } else {
- if (c/2==c)
- return c;
- else
- return f;
- }
-}
-#endif
-
-
-PJ_INLINE(pj_int16_t) fsaturate(double damp)
-{
- if (damp > 32767.0)
- return INT16_MAX;
- else if (damp < -32768.0)
- return INT16_MIN;
- else {
- return (pj_int16_t) RINT(damp);
- }
-}
-
-static void save_history(plc_state_t *s, pj_int16_t *buf, int len)
-{
- if (len >= PLC_HISTORY_LEN)
- {
- /* Just keep the last part of the new data, starting at the beginning of the buffer */
- memcpy(s->history, buf + len - PLC_HISTORY_LEN, sizeof(pj_int16_t)*PLC_HISTORY_LEN);
- s->buf_ptr = 0;
- return;
- }
- if (s->buf_ptr + len > PLC_HISTORY_LEN)
- {
- /* Wraps around - must break into two sections */
- memcpy(s->history + s->buf_ptr, buf, sizeof(pj_int16_t)*(PLC_HISTORY_LEN - s->buf_ptr));
- len -= (PLC_HISTORY_LEN - s->buf_ptr);
- memcpy(s->history, buf + (PLC_HISTORY_LEN - s->buf_ptr), sizeof(pj_int16_t)*len);
- s->buf_ptr = len;
- return;
- }
- /* Can use just one section */
- memcpy(s->history + s->buf_ptr, buf, sizeof(pj_int16_t)*len);
- s->buf_ptr += len;
-}
-/*- End of function --------------------------------------------------------*/
-
-static void normalise_history(plc_state_t *s)
-{
- pj_int16_t tmp[PLC_HISTORY_LEN];
-
- if (s->buf_ptr == 0)
- return;
- memcpy(tmp, s->history, sizeof(pj_int16_t)*s->buf_ptr);
- memcpy(s->history, s->history + s->buf_ptr, sizeof(pj_int16_t)*(PLC_HISTORY_LEN - s->buf_ptr));
- memcpy(s->history + PLC_HISTORY_LEN - s->buf_ptr, tmp, sizeof(pj_int16_t)*s->buf_ptr);
- s->buf_ptr = 0;
-}
-/*- End of function --------------------------------------------------------*/
-
-PJ_INLINE(int) amdf_pitch(int min_pitch, int max_pitch, pj_int16_t amp[], int len)
-{
- int i;
- int j;
- int acc;
- int min_acc;
- int pitch;
-
- pitch = min_pitch;
- min_acc = INT_MAX;
- for (i = max_pitch; i <= min_pitch; i++)
- {
- acc = 0;
- for (j = 0; j < len; j++)
- acc += abs(amp[i + j] - amp[j]);
- if (acc < min_acc)
- {
- min_acc = acc;
- pitch = i;
- }
- }
- return pitch;
-}
-/*- End of function --------------------------------------------------------*/
-
-int plc_rx(plc_state_t *s, pj_int16_t amp[], int len)
-{
- int i;
- /*int overlap_len;*/
- int pitch_overlap;
- float old_step;
- float new_step;
- float old_weight;
- float new_weight;
- float gain;
-
- if (s->missing_samples)
- {
- /* Although we have a real signal, we need to smooth it to fit well
- with the synthetic signal we used for the previous block */
-
- /* The start of the real data is overlapped with the next 1/4 cycle
- of the synthetic data. */
- pitch_overlap = s->pitch >> 2;
- if (pitch_overlap > len)
- pitch_overlap = len;
- gain = 1.0 - s->missing_samples*ATTENUATION_INCREMENT;
- if (gain < 0.0)
- gain = 0.0;
- new_step = 1.0/pitch_overlap;
- old_step = new_step*gain;
- new_weight = new_step;
- old_weight = (1.0 - new_step)*gain;
- for (i = 0; i < pitch_overlap; i++)
- {
- amp[i] = fsaturate(old_weight*s->pitchbuf[s->pitch_offset] + new_weight*amp[i]);
- if (++s->pitch_offset >= s->pitch)
- s->pitch_offset = 0;
- new_weight += new_step;
- old_weight -= old_step;
- if (old_weight < 0.0)
- old_weight = 0.0;
- }
- s->missing_samples = 0;
- }
- save_history(s, amp, len);
- return len;
-}
-/*- End of function --------------------------------------------------------*/
-
-int plc_fillin(plc_state_t *s, pj_int16_t amp[], int len)
-{
- /*pj_int16_t tmp[PLC_PITCH_OVERLAP_MAX];*/
- int i;
- int pitch_overlap;
- float old_step;
- float new_step;
- float old_weight;
- float new_weight;
- float gain;
- pj_int16_t *orig_amp;
- int orig_len;
-
- orig_amp = amp;
- orig_len = len;
- if (s->missing_samples == 0)
- {
- /* As the gap in real speech starts we need to assess the last known pitch,
- and prepare the synthetic data we will use for fill-in */
- normalise_history(s);
- s->pitch = amdf_pitch(PLC_PITCH_MIN, PLC_PITCH_MAX, s->history + PLC_HISTORY_LEN - CORRELATION_SPAN - PLC_PITCH_MIN, CORRELATION_SPAN);
- /* We overlap a 1/4 wavelength */
- pitch_overlap = s->pitch >> 2;
- /* Cook up a single cycle of pitch, using a single of the real signal with 1/4
- cycle OLA'ed to make the ends join up nicely */
- /* The first 3/4 of the cycle is a simple copy */
- for (i = 0; i < s->pitch - pitch_overlap; i++)
- s->pitchbuf[i] = s->history[PLC_HISTORY_LEN - s->pitch + i];
- /* The last 1/4 of the cycle is overlapped with the end of the previous cycle */
- new_step = 1.0/pitch_overlap;
- new_weight = new_step;
- for ( ; i < s->pitch; i++)
- {
- s->pitchbuf[i] = s->history[PLC_HISTORY_LEN - s->pitch + i]*(1.0 - new_weight) + s->history[PLC_HISTORY_LEN - 2*s->pitch + i]*new_weight;
- new_weight += new_step;
- }
- /* We should now be ready to fill in the gap with repeated, decaying cycles
- of what is in pitchbuf */
-
- /* We need to OLA the first 1/4 wavelength of the synthetic data, to smooth
- it into the previous real data. To avoid the need to introduce a delay
- in the stream, reverse the last 1/4 wavelength, and OLA with that. */
- gain = 1.0;
- new_step = 1.0/pitch_overlap;
- old_step = new_step;
- new_weight = new_step;
- old_weight = 1.0 - new_step;
- for (i = 0; i < pitch_overlap; i++)
- {
- amp[i] = fsaturate(old_weight*s->history[PLC_HISTORY_LEN - 1 - i] + new_weight*s->pitchbuf[i]);
- new_weight += new_step;
- old_weight -= old_step;
- if (old_weight < 0.0)
- old_weight = 0.0;
- }
- s->pitch_offset = i;
- }
- else
- {
- gain = 1.0 - s->missing_samples*ATTENUATION_INCREMENT;
- i = 0;
- }
- for ( ; gain > 0.0 && i < len; i++)
- {
- amp[i] = (pj_int16_t)(s->pitchbuf[s->pitch_offset]*gain);
- gain = gain - ATTENUATION_INCREMENT;
- if (++s->pitch_offset >= s->pitch)
- s->pitch_offset = 0;
- }
- for ( ; i < len; i++)
- amp[i] = 0;
- s->missing_samples += orig_len;
- save_history(s, amp, len);
- return len;
-}
-/*- End of function --------------------------------------------------------*/
-
-plc_state_t *plc_init(plc_state_t *s)
-{
- memset(s, 0, sizeof(*s));
- return s;
-}
-/*- End of function --------------------------------------------------------*/
-
-
-/*
- * PJMEDIA specifics
- */
-#include <pj/assert.h>
-#include <pj/pool.h>
-#include <pj/log.h>
-
-#define THIS_FILE "plc_steveu.c"
-
-struct steveu_plc
-{
- plc_state_t state;
- unsigned samples_per_frame;
-};
-
-void* pjmedia_plc_steveu_create(pj_pool_t *pool, unsigned c, unsigned f)
-{
- struct steveu_plc *splc;
-
- PJ_ASSERT_RETURN(c==8000, NULL);
- PJ_UNUSED_ARG(c);
-
- splc = pj_pool_alloc(pool, sizeof(struct steveu_plc));
- plc_init(&splc->state);
- splc->samples_per_frame = f;
-
- return splc;
-}
-
-void pjmedia_plc_steveu_save(void *obj, pj_int16_t *samples)
-{
- struct steveu_plc *splc = obj;
- plc_rx(&splc->state, samples, splc->samples_per_frame);
-}
-
-void pjmedia_plc_steveu_generate(void *obj, pj_int16_t *samples)
-{
- struct steveu_plc *splc = obj;
- //PJ_LOG(5,(THIS_FILE, "PLC: generating lost frame"));
- plc_fillin(&splc->state, samples, splc->samples_per_frame);
-}
-
-/*- End of file ------------------------------------------------------------*/
-
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