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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@37345 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2006-07-10 19:05:48 +00:00
parent 4a3e227291
commit 229ab7d9cf
11 changed files with 353 additions and 384 deletions
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32
plc.c
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@@ -71,13 +71,13 @@ static void save_history(plc_state_t *s, 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(int16_t)*PLC_HISTORY_LEN);
memcpy(s->history, buf + len - PLC_HISTORY_LEN, sizeof(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(int16_t)*(PLC_HISTORY_LEN - s->buf_ptr));
memcpy(s->history + s->buf_ptr, buf, sizeof(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(int16_t)*len);
s->buf_ptr = len;
@@ -97,8 +97,8 @@ static void normalise_history(plc_state_t *s)
if (s->buf_ptr == 0)
return;
memcpy(tmp, s->history, sizeof(int16_t)*s->buf_ptr);
memcpy(s->history, s->history + s->buf_ptr, sizeof(int16_t)*(PLC_HISTORY_LEN - s->buf_ptr));
memcpy(s->history + PLC_HISTORY_LEN - s->buf_ptr, tmp, sizeof(int16_t)*s->buf_ptr);
memcpy(s->history, s->history + s->buf_ptr, sizeof(int16_t) * (PLC_HISTORY_LEN - s->buf_ptr));
memcpy(s->history + PLC_HISTORY_LEN - s->buf_ptr, tmp, sizeof(int16_t) * s->buf_ptr);
s->buf_ptr = 0;
}
@@ -114,9 +114,9 @@ static int __inline__ amdf_pitch(int min_pitch, int max_pitch, int16_t amp[], in
pitch = min_pitch;
min_acc = INT_MAX;
for (i = max_pitch; i <= min_pitch; i++) {
for (i = max_pitch; i <= min_pitch; i++) {
acc = 0;
for (j = 0; j < len; j++)
for (j = 0; j < len; j++)
acc += abs(amp[i + j] - amp[j]);
if (acc < min_acc) {
min_acc = acc;
@@ -154,8 +154,8 @@ int plc_rx(plc_state_t *s, int16_t amp[], int len)
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]);
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;
@@ -200,8 +200,8 @@ int plc_fillin(plc_state_t *s, int16_t amp[], int len)
/* 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;
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
@@ -211,12 +211,12 @@ int plc_fillin(plc_state_t *s, int16_t amp[], int len)
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;
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]);
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)
@@ -227,13 +227,13 @@ int plc_fillin(plc_state_t *s, int16_t amp[], int len)
gain = 1.0 - s->missing_samples*ATTENUATION_INCREMENT;
i = 0;
}
for ( ; gain > 0.0 && i < len; i++) {
amp[i] = s->pitchbuf[s->pitch_offset]*gain;
for ( ; gain > 0.0 && i < len; i++) {
amp[i] = s->pitchbuf[s->pitch_offset] * gain;
gain -= ATTENUATION_INCREMENT;
if (++s->pitch_offset >= s->pitch)
s->pitch_offset = 0;
}
for ( ; i < len; i++)
for ( ; i < len; i++)
amp[i] = 0;
s->missing_samples += orig_len;
save_history(s, amp, len);