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milan-avb: AAF media-clock recovery estimator + play-loop actuator + io_changed, SET_CLOCK_SOURCE switch, skip CRF audio data plane

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hackerman-kl 2026-05-31 15:06:14 +02:00 • committed by Wim Taymans
parent 66959ca678
commit 90114c9839
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63
src/modules/module-avb/play-loop.h Normal file
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/* AVB support */
/* SPDX-FileCopyrightText: Copyright © 2025 Kebag-Logic */
/* SPDX-License-Identifier: MIT */
/*
* play-loop.h — consume-side actuator for the listener.
*
* Pure (no PipeWire deps) so it can be unit-tested like mc-recover.h. Keeps the
* listener ring at a target fill by trimming the output resampler ratio
* (SPA_IO_RateMatch). Same loop as module-rtp's receiver:
* error = target - avail; corr = spa_dll_update(dll, error); rate = ff / corr
* ff = nominal/recovered rate feeds the recovered clock forward; the DLL trims
* the rest. The sign is the trap (same as the old mc_recover bug); test_play_loop
* locks it: converges on the right sign, diverges on the wrong one.
*/
#ifndef AVB_PLAY_LOOP_H
#define AVB_PLAY_LOOP_H
#include <stdbool.h>
#include <spa/utils/defs.h>
#include <spa/utils/dll.h>
struct play_loop {
bool init;
struct spa_dll dll;
double corr; /* DLL output, ~1.0 */
double rate; /* last applied resampler ratio (ff / corr) */
};
static inline void play_loop_reset(struct play_loop *p)
{
p->init = false;
p->corr = 1.0;
p->rate = 1.0;
}
/* One step. error_samples = target - avail; max_error clamps a transient;
* ff_ratio = nominal/recovered rate (1.0 = no feedforward). Returns the ratio
* to apply via pw_stream_set_rate(). */
static inline double play_loop_update(struct play_loop *p, double error_samples,
double max_error, double ff_ratio, unsigned period, unsigned rate)
{
if (!p->init) {
spa_dll_init(&p->dll);
spa_dll_set_bw(&p->dll, SPA_DLL_BW_MIN, period, rate);
p->corr = 1.0;
p->rate = ff_ratio;
p->init = true;
}
error_samples = SPA_CLAMPD(error_samples, -max_error, max_error);
p->corr = spa_dll_update(&p->dll, error_samples);
/* clamp ±10 %, guards 1/corr */
if (p->corr < 0.9)
p->corr = 0.9;
else if (p->corr > 1.1)
p->corr = 1.1;
p->rate = ff_ratio / p->corr;
return p->rate;
}
#endif /* AVB_PLAY_LOOP_H */