Moved plc, resample, and mp3 to third_party

git-svn-id: http://svn.pjsip.org/repos/pjproject/branches/split-3rd-party@1175 74dad513-b988-da41-8d7b-12977e46ad98

1 files changed, 338 insertions, 0 deletions

diff --git a/third_party/plc_steveu/plc_steveu.c b/third_party/plc_steveu/plc_steveu.c
new file mode 100644
index 00000000..3326b748
--- /dev/null
+++ b/third_party/plc_steveu/plc_steveu.c
@@ -0,0 +1,338 @@
+/*
+ * 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 ------------------------------------------------------------*/
+