Updated lib gstreamer sh utils file to support logs based post processing

Signed-off-by: Nitin Nakka <nitinn@qti.qualcomm.com>

Author: nitinn22

Runner/utils/lib_gstreamer.sh

@@ -498,3 +498,73 @@ gstreamer_build_playback_pipeline() {
   printf '%s\n' "filesrc location=${file} ! ${dec} ! audioconvert ! audioresample ! ${sinkElem}"
   return 0
 }
+
+# -------------------- GStreamer error log checker --------------------
+# gstreamer_check_errors <logfile>
+# Returns: 0 if no critical errors found, 1 if errors found
+# Checks for common GStreamer ERROR patterns that indicate failure
+gstreamer_check_errors() {
+  logfile="$1"
+  
+  [ -f "$logfile" ] || return 0
+  
+  # Check for critical ERROR messages
+  if grep -q -E "^ERROR:|ERROR: from element|Internal data stream error|streaming stopped, reason not-negotiated|Could not open|No such file|Permission denied|Failed to|Cannot" "$logfile" 2>/dev/null; then
+    return 1
+  fi
+  
+  # Check for pipeline preroll failures
+  if grep -q -E "pipeline doesn't want to preroll|pipeline doesn't want to play" "$logfile" 2>/dev/null; then
+    return 1
+  fi
+  
+  # Check for state change failures
+  if grep -q -E "failed to change state|state change failed" "$logfile" 2>/dev/null; then
+    return 1
+  fi
+  
+  return 0
+}
+
+# -------------------- GStreamer log validation with detailed reporting --------------------
+# gstreamer_validate_log <logfile> <testname>
+# Returns: 0 if validation passes, 1 if errors found
+# Logs detailed error information if errors are detected
+gstreamer_validate_log() {
+  logfile="$1"
+  testname="${2:-test}"
+  
+  [ -f "$logfile" ] || {
+    log_warn "$testname: Log file not found: $logfile"
+    return 1
+  }
+  
+  if ! gstreamer_check_errors "$logfile"; then
+    log_fail "$testname: GStreamer errors detected in log"
+    
+    # Extract and log specific error messages
+    if grep -q "ERROR:" "$logfile" 2>/dev/null; then
+      log_fail "Error messages found:"
+      grep "ERROR:" "$logfile" 2>/dev/null | head -n 5 | while IFS= read -r line; do
+        log_fail "  $line"
+      done
+    fi
+    
+    # Check for specific failure reasons
+    if grep -q "not-negotiated" "$logfile" 2>/dev/null; then
+      log_fail "  Reason: Format negotiation failed (caps mismatch)"
+    fi
+    
+    if grep -q "Could not open" "$logfile" 2>/dev/null; then
+      log_fail "  Reason: File or device access failed"
+    fi
+    
+    if grep -q "No such file" "$logfile" 2>/dev/null; then
+      log_fail "  Reason: File not found"
+    fi
+    
+    return 1
+  fi
+  
+  return 0
+}