[vlc-devel] [RFC PATCH 2/2] alsa: implement non-blocking play()

[Rémi Denis-Courmont]

Le tiistaina 12. maaliskuuta 2019, 19.18.43 EET Thomas Guillem a écrit :
> ---
>  modules/audio_output/alsa.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/modules/audio_output/alsa.c b/modules/audio_output/alsa.c
> index 5d30d05af9..5c44df4a6e 100644
> --- a/modules/audio_output/alsa.c
> +++ b/modules/audio_output/alsa.c
> @@ -47,6 +47,7 @@ typedef struct
>      vlc_fourcc_t format; /**< Sample format */
>      uint8_t chans_table[AOUT_CHAN_MAX]; /**< Channels order table */
>      uint8_t chans_to_reorder; /**< Number of channels to reorder */
> +    vlc_tick_t buffer_len;
> 
>      bool soft_mute;
>      float soft_gain;
> @@ -411,7 +412,7 @@ static int Start (audio_output_t *aout,
> audio_sample_format_t *restrict fmt) /* Open the device */
>      snd_pcm_t *pcm;
>      /* VLC always has a resampler. No need for ALSA's. */
> -    const int mode = SND_PCM_NO_AUTO_RESAMPLE;
> +    const int mode = SND_PCM_NO_AUTO_RESAMPLE | SND_PCM_NONBLOCK;

That's meant to be used with an I/O event loop; the code is even in old VLC 
versions - or in the ALSA input module.

-- 
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