Support FLOATs in format to bit depth conversion

Expand ALSA text to bit depth conversion
function with support for FLOATs.

Signed-off-by: Arkadiusz Cholewinski <arkadiuszx.cholewinski@intel.com>

Author: gbarkadiusz

case-lib/lib.sh

@@ -774,8 +774,22 @@ parse_audio_device() {
 # There is passes PCM sample format while using ALSA tool (arecord)
 # While using TinyALSA (tinycap -b) we need to convert PCM sample fomrat to bits.
 extract_format_number() {
-    # (e.g., extracting '16' from 'S16_LE')
-    printf '%s' "$1" | grep '[0-9]\+' -o
+    local format_string="$1"
+
+    if [[ "$format_string" =~ ^[SU][0-9]+(_.*)?$ ]]; then
+        # Extract the number after S or U manually
+        printf '%s' "${format_string}" | sed -E 's/^[SU]([0-9]+).*$/\1/'
+    elif [[ "$format_string" =~ ^FLOAT[0-9]*$ ]]; then
+        # Extract number after FLOAT
+        local num="${format_string#FLOAT}"
+        if [[ -n "$num" ]]; then
+            printf '%s' "$num"
+        else
+            printf '32'
+        fi
+    else
+        die "Unknown format"
+    fi    
 }
 
 # Initialize the parameters using for audio testing.