From e2ef3a1391956bddefdce8716f28776190122ae3 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 23 Feb 2010 03:23:22 +0100
Subject: [PATCH 177/186] alsa: don't make use of tsched related variables when tsched is disabled

---
 src/modules/alsa/alsa-sink.c   |   34 +++++++++++++++++++++++-----------
 src/modules/alsa/alsa-source.c |   28 +++++++++++++++++-----------
 2 files changed, 40 insertions(+), 22 deletions(-)

diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index a253cc5..3b13cc2 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -632,11 +632,14 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    } else
         *sleep_usec = 0;
 
     return work_done ? 1 : 0;
@@ -769,11 +772,14 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    } else
         *sleep_usec = 0;
 
     return work_done ? 1 : 0;
@@ -1275,6 +1281,9 @@ static void sink_update_requested_latency_cb(pa_sink *s) {
     struct userdata *u = s->userdata;
     size_t before;
     pa_assert(u);
+    pa_assert(u->use_tsched); /* only when timer scheduling is used
+                               * we can dynamically adjust the
+                               * latency */
 
     if (!u->pcm_handle)
         return;
@@ -1309,7 +1318,10 @@ static int process_rewind(struct userdata *u) {
         return -1;
     }
 
-    unused_nbytes = u->tsched_watermark + (size_t) unused * u->frame_size;
+    unused_nbytes = (size_t) unused * u->frame_size;
+
+    if (u->use_tsched)
+        unused_nbytes += u->tsched_watermark;
 
     if (u->hwbuf_size > unused_nbytes)
         limit_nbytes = u->hwbuf_size - unused_nbytes;
@@ -1870,7 +1882,8 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     }
 
     u->sink->parent.process_msg = sink_process_msg;
-    u->sink->update_requested_latency = sink_update_requested_latency_cb;
+    if (u->use_tsched)
+        u->sink->update_requested_latency = sink_update_requested_latency_cb;
     u->sink->set_state = sink_set_state_cb;
     u->sink->set_port = sink_set_port_cb;
     u->sink->userdata = u;
@@ -1919,7 +1932,6 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     } else
         pa_sink_set_fixed_latency(u->sink, pa_bytes_to_usec(u->hwbuf_size, &ss));
 
-
     reserve_update(u);
 
     if (update_sw_params(u) < 0)
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index c9c6048..ecea191 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -603,12 +603,14 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
-        *sleep_usec = 0;
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    }
 
     return work_done ? 1 : 0;
 }
@@ -730,12 +732,14 @@ static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
-        *sleep_usec = 0;
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    }
 
     return work_done ? 1 : 0;
 }
@@ -1205,6 +1209,7 @@ static int source_set_port_cb(pa_source *s, pa_device_port *p) {
 static void source_update_requested_latency_cb(pa_source *s) {
     struct userdata *u = s->userdata;
     pa_assert(u);
+    pa_assert(u->use_tsched);
 
     if (!u->pcm_handle)
         return;
@@ -1693,7 +1698,8 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     }
 
     u->source->parent.process_msg = source_process_msg;
-    u->source->update_requested_latency = source_update_requested_latency_cb;
+    if (u->use_tsched)
+        u->source->update_requested_latency = source_update_requested_latency_cb;
     u->source->set_state = source_set_state_cb;
     u->source->set_port = source_set_port_cb;
     u->source->userdata = u;
-- 
1.7.2.3