Introduce decoder_execute().

[paraslash.git] / filter_common.c

diff --git a/filter_common.c b/filter_common.c
index 7af5ace6533aa88a85b5ea9c8295867192164af0..8e657f5a4e880ea3968991974a8c07e1e75d96db 100644 (file)
--- a/filter_common.c
+++ b/filter_common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -133,9 +133,36 @@ void generic_filter_pre_select(struct sched *s, struct task *t)
        struct filter_node *fn = container_of(t, struct filter_node, task);
 
        t->error = 0;
-       if (btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL) != 0) {
-               s->timeout.tv_sec = 0;
-               s->timeout.tv_usec = 1;
-       }
+       if (btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL) != 0)
+               sched_min_delay(s);
 }
 
+/**
+ * Execute a btr command for a decoder.
+ *
+ * The buffer tree nodes of the writers ask the parent nodes about sample_rate
+ * and the channels count. This function is called by all decoders to answer
+ * these queries.
+ *
+ * \param cmd The command to be executed by the child node.
+ * \param sample_rate Known to the decoder.
+ * \param channels Known to the decoder.
+ * \param result Ascii representation on the answer is stored here.
+ */
+int decoder_execute(const char *cmd, unsigned sample_rate, unsigned channels,
+               char **result)
+{
+       if (!strcmp(cmd, "sample_rate")) {
+               if (sample_rate == 0)
+                       return -E_BTR_NAVAIL;
+               *result = make_message("%u", sample_rate);
+               return 1;
+       }
+       if (!strcmp(cmd, "channels")) {
+               if (channels == 0)
+                       return -E_BTR_NAVAIL;
+               *result = make_message("%u", channels);
+               return 1;
+       }
+       return -ERRNO_TO_PARA_ERROR(ENOTSUP);
+}