diff options
Diffstat (limited to 'meta-pipewire/recipes-multimedia/pipewire/pipewire/0007-alsa-Set-period_size-depending-on-hardware.patch')
| -rw-r--r-- | meta-pipewire/recipes-multimedia/pipewire/pipewire/0007-alsa-Set-period_size-depending-on-hardware.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/meta-pipewire/recipes-multimedia/pipewire/pipewire/0007-alsa-Set-period_size-depending-on-hardware.patch b/meta-pipewire/recipes-multimedia/pipewire/pipewire/0007-alsa-Set-period_size-depending-on-hardware.patch new file mode 100644 index 000000000..f9649400e --- /dev/null +++ b/meta-pipewire/recipes-multimedia/pipewire/pipewire/0007-alsa-Set-period_size-depending-on-hardware.patch @@ -0,0 +1,35 @@ +From bbf9c767d5b353142e03080762bdd805e124d50b Mon Sep 17 00:00:00 2001 +From: Walter Lozano <walter.lozano@collabora.com> +Date: Fri, 7 Aug 2020 10:58:29 -0300 +Subject: [PATCH] alsa: Set period_size depending on hardware + +Currently PipeWire is unable to reproduce audio in systems where DMA +granularity is not burst. + +In order to mitigate this issue, set period_size depending on hardware, +lowering it when snd_pcm_hw_params_is_batch == 1, to reduce DMA +transfers size. + +Signed-off-by: Walter Lozano <walter.lozano@collabora.com> +--- + spa/plugins/alsa/alsa-pcm.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/spa/plugins/alsa/alsa-pcm.c b/spa/plugins/alsa/alsa-pcm.c +index 63d75549..2d3850b7 100644 +--- a/spa/plugins/alsa/alsa-pcm.c ++++ b/spa/plugins/alsa/alsa-pcm.c +@@ -463,6 +463,10 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_ + + dir = 0; + period_size = 1024; ++ if (snd_pcm_hw_params_is_batch(params)) { ++ period_size = 512; ++ spa_log_warn(state->log, NAME" hardware does double buffering, changing period_size to %ld", period_size); ++ } + CHECK(snd_pcm_hw_params_set_period_size_near(hndl, params, &period_size, &dir), "set_period_size_near"); + CHECK(snd_pcm_hw_params_get_buffer_size_max(params, &state->buffer_frames), "get_buffer_size_max"); + CHECK(snd_pcm_hw_params_set_buffer_size_near(hndl, params, &state->buffer_frames), "set_buffer_size_near"); +-- +2.20.1 + |