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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
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