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Reviewing and deciding upon a default buffer size strategy for ALSA

Abierto
#446 9 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
5/5
Tiempo estimado
Más de una semana
Aptitud para principiantes
35/100
Tipo de issue
Nueva funcionalidad
Claridad
Bastante claro
Estado de actividad
Tranquilo
Stack tecnológico
rust

Línea de trabajo

Read the prior discussion linked from the issue, especially the cited comments in pull request #401, to understand the proposed ALSA buffer and period sizing strategies. Then locate the ALSA BufferSize::Default handling in cpal and compare it with the issue’s suggested approach; done means the project has agreed on a suitable default strategy for ALSA.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

help wanted host - alsa platform - linux

#401 finally allows users to specify a fixed buffer size, allowing some control over the trade-off between energy efficiency and low latency.

The BufferSize::Default value allows the user to fallback to whatever the default buffer is provided by the host. However, ALSA is a bit of a special case in that the default size can be extreme, sometimes implying a delay from multiple seconds up to a minute - an impractical delay for the majority of applications. As a temporary workaround, #401 has opted to leave the BufferSize::Default branch to select a ~100ms delay to match what was previously hard-coded. I've opened this issue so that we can discuss a more suitable default strategy for ALSA.

See here and here for prior discussion on potential strategies. Of note, @sniperrifle2004 made the following suggestion:

As an alternative suggestion to the lowish 100ms aplay does this by default: Get the maximum buffer time. Cap it at half a second. Then restrict the period time to near a quarter of this buffer time (It's where I got that metric from. aplay has been immensely useful as both a reference implementation and a tool) and then restrict the buffer time to near the chosen value.

Lenguaje dominante
Rust
Estrellas
4k
Forks
554
Merge medio
3 d 3 h
PR fusionados (30 d)
4

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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