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alsa: use 3 periods in IRQ mode by default

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3 seems to work better as a default for Firewire. It does not actually
add latency because we only keep 1 period filled with data at all times.
This commit is contained in:
Wim Taymans 2025-09-02 17:29:26 +02:00
parent 00bb4a936a
commit 9606b37776
1 changed files with 6 additions and 2 deletions
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8
spa/plugins/alsa/alsa-pcm.c
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@ -2342,8 +2342,12 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
/* period number given use that */ /* period number given use that */
periods = state->default_period_num; periods = state->default_period_num;
else else
/* IRQ mode, use 2 periods or 3 for batch */ /* IRQ mode, use 3 periods. This is a bit of a workaround
periods = state->is_batch ? 3 : 2; * for Firewire devices, which seem to only work with 3 periods.
* For PipeWire it does not actually matter how many periods
* are used, we will always keep 1 filled, so we can work fine
* with anything from 2 periods to MAX. */
periods = 3;
CHECK(snd_pcm_hw_params_set_periods_near(hndl, params, &periods, &dir), "set_periods"); CHECK(snd_pcm_hw_params_set_periods_near(hndl, params, &periods, &dir), "set_periods");
state->buffer_frames = period_size * periods; state->buffer_frames = period_size * periods;
} else { } else {