Support FLOAT_LE, U8, MU_LAW, A_LAW in format to bit depth conversion

Expand ALSA text to bit depth conversion
function with support for FLOAT_LE, U8, MU_LAW, and A_LAW.

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

Author: gbarkadiusz

case-lib/lib.sh

@@ -774,8 +774,36 @@ 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="$1"
+    
+    case "$format_string" in
+        U8)
+            printf '8'
+            ;;
+        S16_LE)
+            printf '16'
+            ;;
+        S24_LE)
+            printf '24'
+            ;;
+        S32_LE)
+            printf '32'
+            ;;
+        FLOAT_LE)
+            # Standard float is 32-bit (single precision).
+            printf '32' 
+            ;;
+        # Compressed formats (typically operate on 8-bit samples)
+        MU_LAW)
+            printf '8'
+            ;;
+        A_LAW)
+            printf '8'
+            ;;
+        *)
+            die "Unknown format" 
+            ;;
+    esac
 }
 
 # Initialize the parameters using for audio testing.