X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=write_common.c;h=8c33b39e08ae783f2ca19ff75f4cda37fcb0a320;hp=3f6c0bbea422bbbc44e16857000b78df6d45a5d8;hb=3010ef96e10cb15d423eef8f9802fbed78744393;hpb=a4eb244ecdf9aaa0f167b3c91d3e276bde99d681;ds=sidebyside

diff --git a/write_common.c b/write_common.c
index 3f6c0bbe..8c33b39e 100644
--- a/write_common.c
+++ b/write_common.c
@@ -7,12 +7,14 @@
 /** \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"
 
@@ -234,6 +236,54 @@ struct writer_node_group *setup_default_wng(void)
 	wng->writer_nodes[0].conf = writers[DEFAULT_WRITER].parse_config("");
 	return wng;
 }
+
+void register_writer_node(struct writer_node *wn, struct btr_node *parent)
+{
+	struct writer *w = writers + wn->writer_num;
+	char *name = make_message("%s writer", writer_names[wn->writer_num]);
+	int ret;
+
+	wn->btrn = btr_new_node(name, parent, w->execute, wn);
+	strcpy(wn->task.status, name);
+	free(name);
+	ret = w->open(wn);
+	wn->task.post_select = w->post_select_btr;
+	wn->task.pre_select = w->pre_select_btr;
+	register_task(&wn->task);
+}
+
+/**
+ * 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.
+ */
+int setup_writer_node(const char *arg, struct btr_node *parent,
+		struct writer_node *wn)
+{
+	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)
+		return -E_WRITE_COMMON_SYNTAX;
+	register_writer_node(wn, parent);
+	return 1;
+}
+
+
 /**
  * Print the help text of all writers to stdout.
  *
@@ -256,3 +306,31 @@ void print_writer_helps(int detailed)
 		ggo_print_help(&w->help, detailed);
 	}
 }
+
+static int get_btr_value(struct btr_node *btrn, const char *key, int32_t *result)
+{
+	char *buf = NULL;
+	int ret = btr_exec_up(btrn, key, &buf);
+
+	if (ret < 0)
+		return ret;
+	ret = para_atoi32(buf, result);
+	free(buf);
+	return ret;
+}
+
+/*
+ * Ask parent btr nodes for the samplerate of the current stream.
+ */
+int get_btr_samplerate(struct btr_node *btrn, int32_t *result)
+{
+	return get_btr_value(btrn, "samplerate", result);
+}
+
+/*
+ * Ask parent btr nodes for the channel count of the current stream.
+ */
+int get_btr_channels(struct btr_node *btrn, int32_t *result)
+{
+	return get_btr_value(btrn, "channels", result);
+}