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src_sinc: define configurable channels

Embedded systems have limited resources and need to lower the default
channel alocation

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>

--- a/src/src_sinc.c

+++ b/src/src_sinc.c

@@ -25,7 +25,13 @@

 #define	SHIFT_BITS				12

 #define	FP_ONE					((double) (((increment_t) 1) << SHIFT_BITS))

 #define	INV_FP_ONE				(1.0 / FP_ONE)

+

+/* Customixe max channls from Kconfig. */

+#ifndef CONFIG_CHAN_NR

 #define MAX_CHANNELS			128

+#else

+#define MAX_CHANNELS 			CONFIG_CHAN_NR

+#endif

 /*========================================================================================

 */