/** \file write_common.c common functions of para_audiod and para_write */
#include <regex.h>
+#include <stdbool.h>
#include "para.h"
#include "string.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
+#include "buffer_tree.h"
#include "write.h"
#include "error.h"
/** 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;
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];
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;
wng->writer_nodes[0].conf = writers[DEFAULT_WRITER].parse_config("");
return wng;
}
+
+/**
+ * Setup a writer node with the default writer.
+ *
+ * If arg is \p NULL, the OS-dependent default writer is used with an empty
+ * configuration string. It defaults to alsa for Linux, osx for OS X, oss for
+ * *BSD and the file writer if neither of these is supported.
+ *
+ * Once the writer configuration has been retrieved, a writer node is created,
+ * its buffer tree node is added to the buffer tree as a child of the given
+ * parent.
+ *
+ * Finally, the new writer node's taks structure is initialized and registered
+ * to the paraslash scheduler.
+ *
+ * \return A pointer to the allocated writer node group.
+ */
+struct writer_node *setup_writer_node(const char *arg, struct btr_node *parent)
+{
+ struct writer_node *wn = para_calloc(sizeof(*wn));
+ struct writer *w;
+ const char *name;
+
+ if (arg)
+ wn->conf = check_writer_arg(arg, &wn->writer_num);
+ else {
+ wn->writer_num = DEFAULT_WRITER;
+ wn->conf = writers[DEFAULT_WRITER].parse_config("");
+ }
+ if (!wn->conf) {
+ free(wn);
+ return NULL;
+ }
+ w = writers + wn->writer_num;
+ name = writer_names[wn->writer_num];
+ wn->btrn = btr_new_node(name, parent, w->execute, wn);
+ sprintf(wn->task.status, "%s", name);
+ w->open(wn);
+ wn->task.post_select = w->post_select_btr;
+ wn->task.pre_select = w->pre_select_btr;
+ register_task(&wn->task);
+ return wn;
+}
+
+
/**
* Print the help text of all writers to stdout.
*