def _extract_psch_and_pkey(m3u8_text):
    """Return (psch_version, pkey) from #EXT-X-MOUFLON:PSCH line if present."""
    for line in m3u8_text.splitlines():
        l = line.strip()
        if not l:
            continue
        if l.upper().startswith('#EXT-X-MOUFLON:PSCH'):
            parts = l.split(':', 3)
            version = parts[2].lower() if len(parts) > 2 else ''
            pkey = parts[3] if len(parts) > 3 else ''
            return version, pkey
    return '', ''

def _extract_psch_and_pkey(m3u8_text):
    """Return (psch_version, pkey) from #EXT-X-MOUFLON:PSCH line if present."""
    last_version = ''
    last_pkey = ''
    for line in m3u8_text.splitlines():
        l = line.strip()
        if not l:
            continue
        if l.upper().startswith('#EXT-X-MOUFLON:PSCH'):
            parts = l.split(':', 3)
            version = parts[2].lower() if len(parts) > 2 else ''
            pkey = parts[3] if len(parts) > 3 else ''
            last_version = version
            last_pkey = pkey
    return last_version, last_pkey