buffer_tree: Add code to splice out a node of the buffer tree.
[paraslash.git] / write_common.c
index 476df8f..3f6c0bb 100644 (file)
@@ -6,6 +6,8 @@
 
 /** \file write_common.c common functions of para_audiod and para_write */
 
+#include <regex.h>
+
 #include "para.h"
 #include "string.h"
 #include "list.h"
@@ -20,7 +22,7 @@ const char *writer_names[] ={WRITER_NAMES};
 /** the array of supported writers */
 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
 
-static void wng_pre_select(__a_unused struct sched *s, struct task *t)
+static void wng_pre_select(struct sched *s, struct task *t)
 {
        struct writer_node_group *g = container_of(t, struct writer_node_group, task);
        int i;
@@ -34,13 +36,25 @@ static void wng_pre_select(__a_unused struct sched *s, struct task *t)
                if (t->error < 0)
                        return;
        }
+       /*
+        * Force a minimal delay if something was written during the previous
+        * call to wng_post_select(). This is necessary because the filter
+        * chain might still have data for us which it couldn't convert during
+        * the previous run due to its buffer size constraints. In this case we
+        * do not want to wait until the next input data arrives as this could
+        * lead to buffer underruns.
+        */
+       if (g->last_written == 0)
+               return;
+       s->timeout.tv_sec = 0;
+       s->timeout.tv_usec = 1;
 }
 
 static void wng_post_select(struct sched *s, struct task *t)
 {
        struct writer_node_group *g = container_of(t, struct writer_node_group, task);
        int i;
-       size_t min_written = 0;
+       size_t min_written = 0, max_written = 0;
 
        FOR_EACH_WRITER_NODE(i, g) {
                struct writer_node *wn = &g->writer_nodes[i];
@@ -52,7 +66,9 @@ static void wng_post_select(struct sched *s, struct task *t)
                        min_written = wn->written;
                else
                        min_written = PARA_MIN(min_written, wn->written);
+               max_written = PARA_MAX(max_written, wn->written);
        }
+       g->last_written = max_written;
        //PARA_INFO_LOG("loaded: %zd, min_written: %zd bytes\n", *g->loaded, min_written);
        if (min_written) {
                *g->loaded -= min_written;