Samuel Thibault, le dim. 11 oct. 2020 17:16:40 +0200, a ecrit: > Samuel Thibault, le dim. 11 oct. 2020 16:35:16 +0200, a ecrit: > > Gregory Nowak, le sam. 10 oct. 2020 20:55:32 -0700, a ecrit: > > > 4. Open the sound card with another application. > > > > Oh, in that case I do get the mixture on my system indeed. > > It seems the buffering is happening inside alsa's dmix then. Could you > try the attached patch on pcaudiolib? (which is the one that configures > the buffering) And this version should be also fixing it for pulseaudio. Samuel
--- src/alsa.c | 3 +++ src/audio_priv.h | 4 ++++ src/pulseaudio.c | 7 +++++++ 3 files changed, 14 insertions(+) --- a/src/alsa.c +++ b/src/alsa.c @@ -99,6 +99,7 @@ alsa_object_open(struct audio_object *ob snd_pcm_hw_params_t *params = NULL; snd_pcm_hw_params_malloc(¶ms); + snd_pcm_uframes_t bufsize = (rate * channels * LATENCY) / 1000; int err = 0; if ((err = snd_pcm_open(&self->handle, self->device ? self->device : "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0) @@ -113,6 +114,8 @@ alsa_object_open(struct audio_object *ob goto error; if ((err = snd_pcm_hw_params_set_channels(self->handle, params, channels)) < 0) goto error; + if ((err = snd_pcm_hw_params_set_buffer_size_near(self->handle, params, &bufsize)) < 0) + goto error; if ((err = snd_pcm_hw_params(self->handle, params)) < 0) goto error; if ((err = snd_pcm_prepare(self->handle)) < 0) --- a/src/pulseaudio.c +++ b/src/pulseaudio.c @@ -74,6 +74,13 @@ pulseaudio_object_open(struct audio_obje } int error = 0; + pa_buffer_attr battr; + + battr.fragsize = (uint32_t) -1; + battr.maxlength = (uint32_t) -1; + battr.minreq = (uint32_t) -1; + battr.prebuf = (uint32_t) -1; + battr.tlength = pa_bytes_per_second(&self->ss) * LATENCY / 1000; self->s = pa_simple_new(NULL, self->application_name, PA_STREAM_PLAYBACK, --- a/src/audio_priv.h +++ b/src/audio_priv.h @@ -52,6 +52,10 @@ struct audio_object int error); }; +/* We try to aim for 10ms cancelation latency, which will be perceived as + * "snappy" by users */ +#define LATENCY 10 + #if defined(_WIN32) || defined(_WIN64) #include <windows.h>
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