au: add util function calc_nsamp() (#42)

baresip · Apr 27, 2022 · 38ab363 · 38ab363
1 parent 22389d4
commit 38ab363
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Showing 4 changed files with 27 additions and 1 deletion.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -62,6 +62,7 @@ add_definitions(-DVERSION="${PROJECT_VERSION}")
 add_library(${PROJECT_NAME}
   src/aac/aac.c
   src/au/fmt.c
+  src/au/util.c
   src/aubuf/aubuf.c
   src/aubuf/ajb.c
   src/auconv/auconv.c

diff --git a/include/rem_au.h b/include/rem_au.h
@@ -18,3 +18,5 @@ enum aufmt {
 
 size_t      aufmt_sample_size(enum aufmt fmt);
 const char *aufmt_name(enum aufmt fmt);
+
+uint32_t calc_nsamp(uint32_t srate, uint8_t channels, uint16_t ptime);
diff --git a/src/au/mod.mk b/src/au/mod.mk
@@ -4,4 +4,4 @@
 # Copyright (C) 2010 Creytiv.com
 #
 
-SRCS	+= au/fmt.c
+SRCS	+= au/fmt.c au/util.c
diff --git a/src/au/util.c b/src/au/util.c
@@ -0,0 +1,23 @@
+/**
+ * @file util.c  Audio utility functions
+ *
+ * Copyright (C) 2022 Commend.com - [email protected]
+ */
+
+#include <re.h>
+#include <rem_au.h>
+
+
+/**
+ * Calculate number of samples from sample rate, channels and packet time
+ *
+ * @param srate    Sample rate in [Hz]
+ * @param channels Number of channels
+ * @param ptime    Packet time in [ms]
+ *
+ * @return Number of samples
+ */
+uint32_t calc_nsamp(uint32_t srate, uint8_t channels, uint16_t ptime)
+{
+	return srate * channels * ptime / 1000;
+}
Original file line number	Diff line number	Diff line change
Expand Up		@@ -18,3 +18,5 @@ enum aufmt {

		size_t aufmt_sample_size(enum aufmt fmt);
		const char *aufmt_name(enum aufmt fmt);

		uint32_t calc_nsamp(uint32_t srate, uint8_t channels, uint16_t ptime);