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Invalid period size specification for ALSA? #913

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abique opened this issue Sep 21, 2024 · 0 comments · May be fixed by #917
Open

Invalid period size specification for ALSA? #913

abique opened this issue Sep 21, 2024 · 0 comments · May be fixed by #917

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@abique
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abique commented Sep 21, 2024

cpal/src/host/alsa/mod.rs

Line 1066 in 6ecfec4

hw_params.set_period_size_near((v / 4) as alsa::pcm::Frames, alsa::ValueOr::Nearest)?;

Hi,
The code above seems wrong to me.
As I understand it, a cpal buffer size correspond to an alsa period size.
So the alsa buffer size should be: nperiods * cpal_buffer_size.

While it is currently cpal_buffer_size / 4 and I suppose that nperiods == 4.

I think that better defaults for cpal would be a nperiods == 2.

Cheers,
Alex
abique added a commit to abique/cpal that referenced this issue Sep 21, 2024
@abique
ALSA: fix buffer size / period size configuration
d115eea 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
This was referenced Sep 21, 2024
Closed
Closed
abique added a commit to abique/cpal that referenced this issue Sep 21, 2024
@abique
ALSA: fix buffer size / period size configuration
2222ff1 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 21, 2024
@abique
ALSA: fix buffer size / period size configuration
d75baff 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 22, 2024
@abique
ALSA: fix buffer size / period size configuration
b1e8a55 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 22, 2024
@abique
ALSA: fix buffer size / period size configuration
0f1c432 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 22, 2024
@abique
ALSA: fix buffer size / period size configuration
f947cef 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 22, 2024
@abique
ALSA: fix buffer size / period size configuration
33308b6 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 24, 2024
@abique
ALSA: fix buffer size / period size configuration
9879b3c 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods.
The default was far too large, 1024 samples is a much more reasonable default (still too large for real-time audio).

Fixes RustAudio#913
@abique abique linked a pull request Sep 24, 2024 that will close this issue
Open
abique added a commit to abique/cpal that referenced this issue Sep 24, 2024
@abique
ALSA: fix buffer size / period size configuration
62324d5 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods ideally.

The default is now set to 1024 samples which is a reasonable default,
yet still too large for real-time audio.

The default value now uses the same code path as custom values.

Fixes RustAudio#913
abique added a commit to abique/cpal that referenced this issue Sep 25, 2024
@abique
ALSA: fix buffer size / period size configuration
8d86b11 
With ALSA, the buffer size is `nperiod * period_size`.
We want 2 periods ideally.

The default is now set to 1024 samples which is a reasonable default,
yet still too large for real-time audio.

The default value now uses the same code path as custom values.

Fixes RustAudio#913
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@abique