File 0042-pcm_plugin-set-the-initial-hw_ptr-appl_ptr-from-the-.patch of Package alsa

From 644514e85da169670e4a490b7b15b5ecfcec92c0 Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Mon, 18 Jan 2021 21:09:43 +0100
Subject: [PATCH 42/44] pcm_plugin: set the initial hw_ptr/appl_ptr from the
 child pcm

The direct plugins (dmix & etc.) sets own initial
hw_ptr and appl_ptr. Use this initial settings
to export correct values in snd_pcm_status().

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 src/pcm/pcm_plugin.c | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/src/pcm/pcm_plugin.c b/src/pcm/pcm_plugin.c
index 7ed6f25a2eea..ff254eba9988 100644
--- a/src/pcm/pcm_plugin.c
+++ b/src/pcm/pcm_plugin.c
@@ -146,15 +146,14 @@ static int snd_pcm_plugin_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
 	return 0;
 }
 
-static int snd_pcm_plugin_prepare(snd_pcm_t *pcm)
+static int snd_pcm_plugin_call_init_cb(snd_pcm_t *pcm, snd_pcm_plugin_t *plugin)
 {
-	snd_pcm_plugin_t *plugin = pcm->private_data;
+	snd_pcm_t *slave = plugin->gen.slave;
 	int err;
-	err = snd_pcm_prepare(plugin->gen.slave);
-	if (err < 0)
-		return err;
-	*pcm->hw.ptr = 0;
-	*pcm->appl.ptr = 0;
+
+	assert(pcm->boundary == slave->boundary);
+	*pcm->hw.ptr = *slave->hw.ptr;
+	*pcm->appl.ptr = *slave->appl.ptr;
 	if (plugin->init) {
 		err = plugin->init(pcm);
 		if (err < 0)
@@ -163,6 +162,16 @@ static int snd_pcm_plugin_prepare(snd_pcm_t *pcm)
 	return 0;
 }
 
+static int snd_pcm_plugin_prepare(snd_pcm_t *pcm)
+{
+	snd_pcm_plugin_t *plugin = pcm->private_data;
+	int err;
+	err = snd_pcm_prepare(plugin->gen.slave);
+	if (err < 0)
+		return err;
+	return snd_pcm_plugin_call_init_cb(pcm, plugin);
+}
+
 static int snd_pcm_plugin_reset(snd_pcm_t *pcm)
 {
 	snd_pcm_plugin_t *plugin = pcm->private_data;
@@ -170,14 +179,7 @@ static int snd_pcm_plugin_reset(snd_pcm_t *pcm)
 	err = snd_pcm_reset(plugin->gen.slave);
 	if (err < 0)
 		return err;
-	*pcm->hw.ptr = 0;
-	*pcm->appl.ptr = 0;
-	if (plugin->init) {
-		err = plugin->init(pcm);
-		if (err < 0)
-			return err;
-	}
-	return 0;
+	return snd_pcm_plugin_call_init_cb(pcm, plugin);
 }
 
 static snd_pcm_sframes_t snd_pcm_plugin_rewindable(snd_pcm_t *pcm)
-- 
2.26.2