Set ALSA buffer time to 100 ms to improve Pipewire playback

Adjust text mode update time to 20 ms to allow time for refills.
frno7 · Jan 7, 2025 · b499c49 · b499c49
1 parent dc0d2e4
commit b499c49
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/lib/out/alsa.c b/lib/out/alsa.c
@@ -216,6 +216,13 @@ static void *alsa_open(const char *output, int frequency, bool nonblocking)
 		pr_fatal_error("%s: ALSA snd_pcm_hw_params_set_channels failed: %s\n",
 			output, snd_strerror(err));
 
+	unsigned int buffer_time = 100000;	/* 100 ms */
+	err = snd_pcm_hw_params_set_buffer_time_near(state->pcm_handle,
+		state->hwparams, &buffer_time, NULL);
+	if (err < 0)
+		pr_fatal_error("%s: ALSA snd_pcm_hw_params_set_buffer_time_near failed: %s\n",
+			output, snd_strerror(err));
+
 	err = snd_pcm_hw_params(state->pcm_handle, state->hwparams);
 	if (err < 0)
 		pr_fatal_error("%s: ALSA snd_pcm_hw_params failed: %s\n",

diff --git a/system/unix/text-mode.c b/system/unix/text-mode.c
@@ -29,6 +29,8 @@
 #include "system/unix/text-mode.h"
 #include "system/unix/tty.h"
 
+#define BUFFER_UPDATE_TIME 20	/* 20 ms */
+
 struct sample_buffer {
 	u64 timestamp;
 
@@ -196,7 +198,7 @@ static u64 sample_buffer_update(struct sample_buffer *sb, u64 timestamp)
 				sb->buffer[sb->index].left,
 				sb->buffer[sb->index].right,
 				sb->output_arg)) {
-			sb->timestamp = timestamp + 100;
+			sb->timestamp = timestamp + (BUFFER_UPDATE_TIME);
 			break;
 		}