ipc4: pcm_converter: Add channel remapping conversion functions

Adds a set of conversion functions that perform both format conversion
and channel remapping. These are required to swap channels for the device
posture feature.

Signed-off-by: Serhiy Katsyuba <serhiy.katsyuba@intel.com>

src/audio/Kconfig

@@ -251,6 +251,13 @@ config PCM_CONVERTER_FORMAT_S32LE
 	help
 	  Support 32 bit processing data format with sign and in little endian format
 
+config PCM_CONVERTER_FORMAT_S16_4LE
+	bool "Support S16_4LE"
+	default y
+	help
+	  Support the format of signed 16-bit little-endian in the 2 lower bytes
+	  of a 32-bit container. This format is used, for example, by the SSP gateway.
+
 config PCM_CONVERTER_FORMAT_FLOAT
 	bool "Support float"
 	default y
@@ -305,6 +312,14 @@ config PCM_CONVERTER_FORMAT_CONVERT_HIFI3
 	help
 	  Use HIFI3 extensions for optimized format conversion (experimental).
 
+config PCM_REMAPPING_CONVERTERS
+	bool "Channel remapping conversions"
+	default y
+	depends on IPC_MAJOR_4
+	help
+	  Enable conversion functions that perform both format conversion
+	  and channel remapping simultaneously.
+
 config TRACE_CHANNEL
 	int "TRACE DMA Channel configuration"
 	default 0

src/audio/pcm_converter/CMakeLists.txt

@@ -4,3 +4,7 @@ add_local_sources(sof
 	pcm_converter.c
 	pcm_converter_generic.c
 	pcm_converter_hifi3.c)
+
+if(CONFIG_PCM_REMAPPING_CONVERTERS)
+	add_local_sources(sof pcm_remap.c)
+endif()