From e3f15104cf0386a0e0a782037e8c0323629be749 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 30 Mar 2009 18:00:23 +0200
Subject: [PATCH] don't enabled tsched on software ALSA devices

---
 src/modules/alsa/alsa-sink.c   |  5 +++++
 src/modules/alsa/alsa-source.c |  5 +++++
 src/modules/alsa/alsa-util.c   | 15 ++++++++++++++-
 src/modules/alsa/alsa-util.h   |  2 ++
 4 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index 7c09553..0296f64 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -1630,6 +1630,11 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         u->use_tsched = use_tsched = FALSE;
     }
 
+    if (use_tsched && !pa_alsa_pcm_is_hw(u->pcm_handle)) {
+        pa_log_info("Device is not a hardware device, disabling timer-based scheduling.");
+        u->use_tsched = use_tsched = FALSE;
+    }
+
     if (u->use_mmap)
         pa_log_info("Successfully enabled mmap() mode.");
 
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index dfd1870..ef365a2 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -1482,6 +1482,11 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
         u->use_tsched = use_tsched = FALSE;
     }
 
+    if (use_tsched && !pa_alsa_pcm_is_hw(u->pcm_handle)) {
+        pa_log_info("Device is not a hardware device, disabling timer-based scheduling.");
+        u->use_tsched = use_tsched = FALSE;
+    }
+
     if (u->use_mmap)
         pa_log_info("Successfully enabled mmap() mode.");
 
diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c
index 3f26aeb..2d0ca10 100644
--- a/src/modules/alsa/alsa-util.c
+++ b/src/modules/alsa/alsa-util.c
@@ -1716,10 +1716,11 @@ char *pa_alsa_get_driver_name(int card) {
 
 char *pa_alsa_get_driver_name_by_pcm(snd_pcm_t *pcm) {
     int card;
-
     snd_pcm_info_t* info;
     snd_pcm_info_alloca(&info);
 
+    pa_assert(pcm);
+
     if (snd_pcm_info(pcm, info) < 0)
         return NULL;
 
@@ -1749,3 +1750,15 @@ char *pa_alsa_get_reserve_name(const char *device) {
 
     return pa_sprintf_malloc("Audio%i", i);
 }
+
+pa_bool_t pa_alsa_pcm_is_hw(snd_pcm_t *pcm) {
+    snd_pcm_info_t* info;
+    snd_pcm_info_alloca(&info);
+
+    pa_assert(pcm);
+
+    if (snd_pcm_info(pcm, info) < 0)
+        return FALSE;
+
+    return snd_pcm_info_get_card(info) >= 0;
+}
diff --git a/src/modules/alsa/alsa-util.h b/src/modules/alsa/alsa-util.h
index fe0f71e..68496d5 100644
--- a/src/modules/alsa/alsa-util.h
+++ b/src/modules/alsa/alsa-util.h
@@ -139,4 +139,6 @@ char *pa_alsa_get_driver_name_by_pcm(snd_pcm_t *pcm);
 
 char *pa_alsa_get_reserve_name(const char *device);
 
+pa_bool_t pa_alsa_pcm_is_hw(snd_pcm_t *pcm);
+
 #endif
-- 
2.7.4