From 2c3075f4304625eb930cc1203091c1c2ba1a90b3 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Thu, 16 Jan 2025 16:16:39 +0100
Subject: [PATCH] pulse-server: make a function to silence a buffer

---
 src/modules/module-protocol-pulse/format.c     | 18 ++++++++++++++++++
 src/modules/module-protocol-pulse/format.h     |  1 +
 .../module-protocol-pulse/pulse-server.c       | 15 +--------------
 3 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/src/modules/module-protocol-pulse/format.c b/src/modules/module-protocol-pulse/format.c
index 5626fe273..b11248fcf 100644
--- a/src/modules/module-protocol-pulse/format.c
+++ b/src/modules/module-protocol-pulse/format.c
@@ -230,6 +230,24 @@ uint32_t sample_spec_frame_size(const struct sample_spec *ss)
 	}
 }
 
+void sample_spec_silence(const struct sample_spec *ss, void *data, size_t size)
+{
+	switch (ss->format) {
+	case SPA_AUDIO_FORMAT_U8:
+		memset(data, 0x80, size);
+		break;
+	case SPA_AUDIO_FORMAT_ALAW:
+		memset(data, 0x80 ^ 0x55, size);
+		break;
+	case SPA_AUDIO_FORMAT_ULAW:
+		memset(data, 0x00 ^ 0xff, size);
+		break;
+	default:
+		memset(data, 0, size);
+		break;
+	}
+}
+
 bool sample_spec_valid(const struct sample_spec *ss)
 {
 	return (sample_spec_frame_size(ss) > 0 &&
diff --git a/src/modules/module-protocol-pulse/format.h b/src/modules/module-protocol-pulse/format.h
index 13df52e99..d564b1822 100644
--- a/src/modules/module-protocol-pulse/format.h
+++ b/src/modules/module-protocol-pulse/format.h
@@ -182,6 +182,7 @@ const char *format_encoding2name(enum encoding enc);
 uint32_t format_encoding2id(enum encoding enc);
 
 uint32_t sample_spec_frame_size(const struct sample_spec *ss);
+void sample_spec_silence(const struct sample_spec *ss, void *data, size_t size);
 bool sample_spec_valid(const struct sample_spec *ss);
 
 void sample_spec_fix(struct sample_spec *ss, struct channel_map *map,
diff --git a/src/modules/module-protocol-pulse/pulse-server.c b/src/modules/module-protocol-pulse/pulse-server.c
index 313054b5f..ceb8ec7f0 100644
--- a/src/modules/module-protocol-pulse/pulse-server.c
+++ b/src/modules/module-protocol-pulse/pulse-server.c
@@ -1424,20 +1424,7 @@ static void stream_process(void *data)
 		if (avail < (int32_t)minreq || stream->corked) {
 			/* underrun, produce a silence buffer */
 			size = SPA_MIN(d->maxsize, minreq);
-			switch (stream->ss.format) {
-			case SPA_AUDIO_FORMAT_U8:
-				memset(p, 0x80, size);
-				break;
-			case SPA_AUDIO_FORMAT_ALAW:
-				memset(p, 0x80 ^ 0x55, size);
-				break;
-			case SPA_AUDIO_FORMAT_ULAW:
-				memset(p, 0x00 ^ 0xff, size);
-				break;
-			default:
-				memset(p, 0, size);
-				break;
-			}
+			sample_spec_silence(&stream->ss, p, size);
 
 			if (stream->draining && !stream->corked) {
 				stream->draining = false;