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dejitter: Added timeout for interpolation

This commit is contained in:
Andreas Eversberg 2022-10-30 09:23:39 +01:00
parent 825f395e09
commit ed0f8694f7
2 changed files with 31 additions and 11 deletions
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40
src/libjitter/jitter.c
View File

@ -51,7 +51,8 @@
*
* Missing packets are interpolated by repeating last 20ms of audio (optional)
* or by inserting zeroes (sample size > 1 byte) or by inserting 0xff (sample
* size = 1).
* size = 1). In case of repeating audio, the number of turns are limited until
* buffer is reset to silence, if no frames are received for a certain time.
*
* Optionally the constant delay will be measured continuously and lowered if
* greater than minimum window size. (adaptive jitter buffer size)
@ -82,6 +83,7 @@
#define INITIAL_DELAY_INTERVAL 0.5
#define REPEAT_DELAY_INTERVAL 3.0
#define EXTRA_BUFFER 0.020 // 20 ms
#define EXTRA_TIMEOUT 0.500 // maximum time to repeat extrapolation buffer
/* uncomment to enable heavy debugging */
//#define HEAVY_DEBUG
@ -106,7 +108,7 @@ int jitter_create(jitter_t *jb, const char *name, double samplerate, int sample_
rc = -ENOMEM;
goto error;
}
jb->extra_timeout_max = (int)ceil(EXTRA_TIMEOUT / EXTRA_BUFFER);
/* optionally give a string to be show with the debug */
if (name && *name)
@ -124,6 +126,14 @@ error:
return rc;
}
static void clear_extra_buffer(jitter_t *jb)
{
if (jb->sample_size == 1)
memset(jb->extra_samples, 0xff, jb->sample_size * jb->extra_size);
else
memset(jb->extra_samples, 0, jb->sample_size * jb->extra_size);
}
/* reset jitter buffer */
void jitter_reset(jitter_t *jb)
{
@ -147,13 +157,10 @@ void jitter_reset(jitter_t *jb)
jb->frame_list = NULL;
/* clear extrapolation buffer */
if (jb->extra_samples) {
if (jb->sample_size == 1)
memset(jb->extra_samples, 0xff, jb->sample_size * jb->extra_size);
else
memset(jb->extra_samples, 0, jb->sample_size * jb->extra_size);
}
if (jb->extra_samples)
clear_extra_buffer(jb);
jb->extra_index = 0;
jb->extra_timeout_count = jb->extra_timeout_max; /* no data in buffer yet, so we set timeout condition */
/* delay measurement and reduction */
jb->delay_counter = 0.0;
@ -353,8 +360,18 @@ void jitter_load(jitter_t *jb, void *samples, int length)
count2 = jb->extra_size - jb->extra_index;
memcpy(samples, (uint8_t *)jb->extra_samples + jb->extra_index * jb->sample_size, count2 * jb->sample_size);
jb->extra_index += count2;
if (jb->extra_index == jb->extra_size)
if (jb->extra_index == jb->extra_size) {
jb->extra_index = 0;
if ((jb->window_flags & JITTER_FLAG_REPEAT) && jb->extra_timeout_count < jb->extra_timeout_max) {
jb->extra_timeout_count++;
if (jb->extra_timeout_count == jb->extra_timeout_max) {
#ifdef HEAVY_DEBUG
PDEBUG(DJITTER, DEBUG_DEBUG, "%s Repeated jitter buffer enough, clearing to silence.\n", jb->name);
#endif
clear_extra_buffer(jb);
}
}
}
samples = (uint8_t *)samples + count2 * jb->sample_size;
length -= count2;
jb->window_timestamp += count2;
@ -371,8 +388,8 @@ void jitter_load(jitter_t *jb, void *samples, int length)
count = length;
if (jf->length - index < count)
count = jf->length - index;
/* if extrapolation is used, limit count to what we can store into buffer */
if (jb->extra_samples && jb->extra_size - jb->extra_index < count)
/* if extrapolation is to be written, limit count to what we can store into buffer */
if ((jb->window_flags & JITTER_FLAG_REPEAT) && jb->extra_size - jb->extra_index < count)
count = jb->extra_size - jb->extra_index;
/* copy samples from packet to play out, increment sample pointer and decrement length */
#ifdef HEAVY_DEBUG
@ -387,6 +404,7 @@ void jitter_load(jitter_t *jb, void *samples, int length)
jb->extra_index += count;
if (jb->extra_index == jb->extra_size)
jb->extra_index = 0;
jb->extra_timeout_count = 0; /* now we have new data, we reset timeout condition */
}
/* increment time stamp */
jb->window_timestamp += count;

2
src/libjitter/jitter.h
View File

@ -45,6 +45,8 @@ typedef struct jitter {
int extra_size;
int extra_index;
void *extra_samples;
int extra_timeout_max;
int extra_timeout_count;
/* list of frames */
jitter_frame_t *frame_list;