Add get_btr_samplerate() and get_btr_channels().

These are needed by more than one writer.

diff --git a/write_common.c b/write_common.c
index 14ce819515010e84635e5f313f58a78071487f0f..9af8d682075ccf91de2bff3ff7625ab7d9f0a598 100644 (file)
--- a/write_common.c
+++ b/write_common.c
@@ -304,3 +304,31 @@ 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);
+}

diff --git a/write_common.h b/write_common.h
index f34ad3fe7f9da8834e99645b9f15d35b21a00f21..ef5a7c03603a537034f5d19d62df91498e493505 100644 (file)
--- a/write_common.h
+++ b/write_common.h
@@ -14,3 +14,5 @@ void *check_writer_arg(const char *wa, int *writer_num);
 struct writer_node_group *setup_default_wng(void);
 void print_writer_helps(int detailed);
 struct writer_node *setup_writer_node(const char *arg, struct btr_node *parent);
+int get_btr_samplerate(struct btr_node *btrn, int32_t *result);
+int get_btr_channels(struct btr_node *btrn, int32_t *result);