def __init__(self, trace, data, dataquality):
"""
The init function requires a ObsPy Trace object which will be used to
fill self.mstg.
"""
self.mst = clibmseed.mst_init(None)
# Figure out the datatypes.
sampletype = SAMPLETYPE[data.dtype.type]
# Set the header values.
self.mst.contents.network = trace.stats.network
self.mst.contents.station = trace.stats.station
self.mst.contents.location = trace.stats.location
self.mst.contents.channel = trace.stats.channel
self.mst.contents.dataquality = dataquality
self.mst.contents.type = "\x00"
self.mst.contents.starttime = util._convertDatetimeToMSTime(trace.stats.starttime)
self.mst.contents.endtime = util._convertDatetimeToMSTime(trace.stats.endtime)
self.mst.contents.samprate = trace.stats.sampling_rate
self.mst.contents.samplecnt = trace.stats.npts
self.mst.contents.numsamples = trace.stats.npts
self.mst.contents.sampletype = sampletype
# libmseed expects data in the native byteorder.
if data.dtype.byteorder != "=":
data = data.byteswap()
# Copy the data. The copy appears to be necessary so that Python's
# garbage collection does not interfere it.
bytecount = data.itemsize * data.size
self.mst.contents.datasamples = clibmseed.allocate_bytes(bytecount)
C.memmove(self.mst.contents.datasamples, data.ctypes.get_data(), bytecount)
def __init__(self, trace, data, dataquality):
"""
The init function requires a ObsPy Trace object which will be used to
fill self.mstg.
"""
# Initialize MSTraceGroup
mstg = clibmseed.mst_initgroup(None)
self.mstg = mstg
# Set numtraces.
mstg.contents.numtraces = 1
# Initialize MSTrace object and connect with group
mstg.contents.traces = clibmseed.mst_init(None)
chain = mstg.contents.traces
# Figure out the datatypes.
sampletype = SAMPLETYPE[data.dtype.type]
c_dtype = DATATYPES[sampletype]
# Set the header values.
chain.contents.network = trace.stats.network
chain.contents.station = trace.stats.station
chain.contents.location = trace.stats.location
chain.contents.channel = trace.stats.channel
chain.contents.dataquality = dataquality
chain.contents.type = '\x00'
chain.contents.starttime = \
util._convertDatetimeToMSTime(trace.stats.starttime)
chain.contents.endtime = \
util._convertDatetimeToMSTime(trace.stats.endtime)
chain.contents.samprate = trace.stats.sampling_rate
chain.contents.samplecnt = trace.stats.npts
chain.contents.numsamples = trace.stats.npts
chain.contents.sampletype = sampletype
# Create a single datapoint and resize its memory to be able to
# hold all datapoints.
tempdatpoint = c_dtype()
datasize = SAMPLESIZES[sampletype] * trace.stats.npts
# XXX: Ugly workaround for traces with less than 17 data points
if datasize < 17:
datasize = 17
C.resize(tempdatpoint, datasize)
# The datapoints in the MSTG structure are a pointer to the memory
# area reserved for tempdatpoint.
chain.contents.datasamples = C.cast(C.pointer(tempdatpoint),
C.c_void_p)
# Swap if wrong byte order because libmseed expects native byteorder.
if data.dtype.byteorder != "=":
data = data.byteswap()
# Pointer to the NumPy data buffer.
datptr = data.ctypes.get_data()
# Manually move the contents of the NumPy data buffer to the
# address of the previously created memory area.
C.memmove(chain.contents.datasamples, datptr, datasize)
def __init__(self, trace, data, dataquality):
"""
The init function requires a ObsPy Trace object which will be used to
fill self.mstg.
"""
# Initialize MSTraceGroup
mstg = clibmseed.mst_initgroup(None)
self.mstg = mstg
# Set numtraces.
mstg.contents.numtraces = 1
# Initialize MSTrace object and connect with group
mstg.contents.traces = clibmseed.mst_init(None)
chain = mstg.contents.traces
# Figure out the datatypes.
sampletype = SAMPLETYPE[data.dtype.type]
c_dtype = DATATYPES[sampletype]
# Set the header values.
chain.contents.network = trace.stats.network
chain.contents.station = trace.stats.station
chain.contents.location = trace.stats.location
chain.contents.channel = trace.stats.channel
chain.contents.dataquality = dataquality
chain.contents.type = '\x00'
chain.contents.starttime = \
util._convertDatetimeToMSTime(trace.stats.starttime)
chain.contents.endtime = \
util._convertDatetimeToMSTime(trace.stats.endtime)
chain.contents.samprate = trace.stats.sampling_rate
chain.contents.samplecnt = trace.stats.npts
chain.contents.numsamples = trace.stats.npts
chain.contents.sampletype = sampletype
# Create a single datapoint and resize its memory to be able to
# hold all datapoints.
tempdatpoint = c_dtype()
datasize = SAMPLESIZES[sampletype] * trace.stats.npts
# XXX: Ugly workaround for traces with less than 17 data points
if datasize < 17:
datasize = 17
C.resize(tempdatpoint, datasize)
# The datapoints in the MSTG structure are a pointer to the memory
# area reserved for tempdatpoint.
chain.contents.datasamples = C.cast(C.pointer(tempdatpoint),
C.c_void_p)
# Swap if wrong byte order because libmseed expects native byteorder.
if data.dtype.byteorder != "=":
data = data.byteswap()
# Pointer to the NumPy data buffer.
datptr = data.ctypes.get_data()
# Manually move the contents of the NumPy data buffer to the
# address of the previously created memory area.
C.memmove(chain.contents.datasamples, datptr, datasize)
def __init__(self, trace, data, dataquality):
"""
The init function requires a ObsPy Trace object which will be used to
fill self.mstg.
"""
self.mst = clibmseed.mst_init(None)
# Figure out the datatypes.
sampletype = SAMPLETYPE[data.dtype.type]
# Set the header values.
self.mst.contents.network = trace.stats.network
self.mst.contents.station = trace.stats.station
self.mst.contents.location = trace.stats.location
self.mst.contents.channel = trace.stats.channel
self.mst.contents.dataquality = dataquality
self.mst.contents.type = '\x00'
self.mst.contents.starttime = \
util._convertDatetimeToMSTime(trace.stats.starttime)
self.mst.contents.endtime = \
util._convertDatetimeToMSTime(trace.stats.endtime)
self.mst.contents.samprate = trace.stats.sampling_rate
self.mst.contents.samplecnt = trace.stats.npts
self.mst.contents.numsamples = trace.stats.npts
self.mst.contents.sampletype = sampletype
# libmseed expects data in the native byteorder.
if data.dtype.byteorder != "=":
data = data.byteswap()
# Copy the data. The copy appears to be necessary so that Python's
# garbage collection does not interfere it.
bytecount = data.itemsize * data.size
self.mst.contents.datasamples = clibmseed.allocate_bytes(bytecount)
C.memmove(self.mst.contents.datasamples, data.ctypes.get_data(),
bytecount)
def writeMSEED(stream, filename, encoding=None, reclen=None, byteorder=None, flush=1, verbose=0, **_kwargs):
"""
Write Mini-SEED file from a Stream object.
.. warning::
This function should NOT be called directly, it registers via the
the :meth:`~obspy.core.stream.Stream.write` method of an
ObsPy :class:`~obspy.core.stream.Stream` object, call this instead.
:type stream: :class:`~obspy.core.stream.Stream`
:param stream: A Stream object.
:type filename: str
:param filename: Name of the output file
:type encoding: int or str, optional
:param encoding: Should be set to one of the following supported Mini-SEED
data encoding formats: ASCII (``0``)*, INT16 (``1``), INT32 (``3``),
FLOAT32 (``4``)*, FLOAT64 (``5``)*, STEIM1 (``10``) and STEIM2
(``11``)*. Default data types a marked with an asterisk. Currently
INT24 (``2``) is not supported due to lacking NumPy support.
:type reclen: int, optional
:param reclen: Should be set to the desired data record length in bytes
which must be expressible as 2 raised to the power of X where X is
between (and including) 8 to 20.
Defaults to 4096
:type byteorder: [``0`` or ``'<'`` | ``1`` or ``'>'`` | ``'='``], optional
:param byteorder: Must be either ``0`` or ``'<'`` for LSBF or
little-endian, ``1`` or ``'>'`` for MBF or big-endian. ``'='`` is the
native byteorder. If ``-1`` it will be passed directly to libmseed
which will also default it to big endian. Defaults to big endian.
:type flush: int, optional
:param flush: If it is not zero all of the data will be packed into
records, otherwise records will only be packed while there are
enough data samples to completely fill a record.
:type verbose: int, optional
:param verbose: Controls verbosity, a value of zero will result in no
diagnostic output.
.. note::
The reclen, encoding and byteorder keyword arguments can be set
in the stats.mseed of each :class:`~obspy.core.trace.Trace` as well as
as kwargs of this function. If both are given the kwargs will be used.
.. rubric:: Example
>>> from obspy.core import read
>>> st = read()
>>> st.write('filename.mseed', format='MSEED') # doctest: +SKIP
"""
# Some sanity checks for the keyword arguments.
if reclen is not None and reclen not in VALID_RECORD_LENGTHS:
msg = (
"Invalid record length. The record length must be a value\n" + "of 2 to the power of X where 8 <= X <= 20."
)
raise ValueError(msg)
if byteorder is not None and byteorder not in [0, 1, -1]:
if byteorder == "=":
byteorder = NATIVE_BYTEORDER
# If not elif because NATIVE_BYTEORDER is '<' or '>'.
if byteorder == "<":
byteorder = 0
elif byteorder == ">":
byteorder = 1
else:
msg = "Invalid byteorder. It must be either '<', '>', '=', " + "0, 1 or -1"
raise ValueError(msg)
# Check if encoding kwarg is set and catch invalid encodings.
# XXX: Currently INT24 is not working due to lacking NumPy support.
encoding_strings = dict([(v[0], k) for (k, v) in ENCODINGS.iteritems()])
if encoding is not None:
if isinstance(encoding, int) and encoding in ENCODINGS:
pass
elif encoding and isinstance(encoding, basestring) and encoding in encoding_strings:
encoding = encoding_strings[encoding]
else:
msg = "Invalid encoding %s. Valid encodings: %s"
raise ValueError(msg % (encoding, encoding_strings))
trace_attributes = []
use_blkt_1001 = 0
# The data might need to be modified. To not modify the input data keep
# references of which data to finally write.
trace_data = []
# Loop over every trace and figure out the correct settings.
for _i, trace in enumerate(stream):
# Create temporary dict for storing information while writing.
trace_attr = {}
trace_attributes.append(trace_attr)
stats = trace.stats
# Figure out whether or not to use Blockette 1001. This check is done
# once to ensure that Blockette 1001 is either written for every record
# in the file or for none. It checks the starttime as well as the
# sampling rate. If either one has a precision of more than 100
# microseconds, Blockette 1001 will be written for every record.
starttime = util._convertDatetimeToMSTime(trace.stats.starttime)
if starttime % 100 != 0 or (1.0 / trace.stats.sampling_rate * HPTMODULUS) % 100 != 0:
use_blkt_1001 += 1
# Determine if a blockette 100 will be needed to represent the input
# sample rate or if the sample rate in the fixed section of the data
# header will suffice (see ms_genfactmult in libmseed/genutils.c)
if trace.stats.sampling_rate >= 32727.0 or trace.stats.sampling_rate <= (1.0 / 32727.0):
use_blkt_100 = True
else:
use_blkt_100 = False
# Set data quality to indeterminate (= D) if it is not already set.
try:
trace_attr["dataquality"] = trace.stats["mseed"]["dataquality"].upper()
except:
trace_attr["dataquality"] = "D"
# Sanity check for the dataquality to get a nice Python exception
# instead of a C error.
if trace_attr["dataquality"] not in ["D", "R", "Q", "M"]:
msg = (
"Invalid dataquality in Stream[%i].stats" % _i
+ ".mseed.dataquality\n"
+ "The dataquality for Mini-SEED must be either D, R, Q "
+ "or M. See the SEED manual for further information."
)
raise ValueError(msg)
# Check that data is of the right type.
if not isinstance(trace.data, np.ndarray):
msg = "Unsupported data type %s" % type(trace.data) + " for Stream[%i].data." % _i
raise ValueError(msg)
# Check if ndarray is contiguous (see #192, #193)
if not trace.data.flags.c_contiguous:
msg = "Detected non contiguous data array in Stream[%i]" % _i + ".data. Trying to fix array."
warnings.warn(msg)
trace.data = np.require(trace.data, requirements=("C_CONTIGUOUS",))
# Handle the record length.
if reclen is not None:
trace_attr["reclen"] = reclen
elif hasattr(stats, "mseed") and hasattr(stats.mseed, "record_length"):
if stats.mseed.record_length in VALID_RECORD_LENGTHS:
trace_attr["reclen"] = stats.mseed.record_length
else:
msg = (
"Invalid record length in Stream[%i].stats." % _i
+ "mseed.reclen.\nThe record length must be a value "
+ "of 2 to the power of X where 8 <= X <= 20."
)
raise ValueError(msg)
else:
trace_attr["reclen"] = 4096
# Handle the byteorder.
if byteorder is not None:
trace_attr["byteorder"] = byteorder
elif hasattr(stats, "mseed") and hasattr(stats.mseed, "byteorder"):
if stats.mseed.byteorder in [0, 1, -1]:
trace_attr["byteorder"] = stats.mseed.byteorder
elif stats.mseed.byteorder == "=":
if NATIVE_BYTEORDER == "<":
trace_attr["byteorder"] = 0
else:
trace_attr["byteorder"] = 1
elif stats.mseed.byteorder == "<":
trace_attr["byteorder"] = 0
elif stats.mseed.byteorder == ">":
trace_attr["byteorder"] = 1
else:
msg = (
"Invalid byteorder in Stream[%i].stats." % _i
+ "mseed.byteorder. It must be either '<', '>', '=',"
+ " 0, 1 or -1"
)
raise ValueError(msg)
else:
trace_attr["byteorder"] = 1
if trace_attr["byteorder"] == -1:
if NATIVE_BYTEORDER == "<":
trace_attr["byteorder"] = 0
else:
trace_attr["byteorder"] = 1
# Handle the encoding.
trace_attr["encoding"] = None
if encoding is not None:
# Check if the dtype for all traces is compatible with the enforced
# encoding.
id, _, dtype = ENCODINGS[encoding]
if trace.data.dtype.type != dtype:
msg = """
Wrong dtype for Stream[%i].data for encoding %s.
Please change the dtype of your data or use an appropriate
encoding. See the obspy.mseed documentation for more
information.
""" % (
_i,
id,
)
raise Exception(msg)
trace_attr["encoding"] = encoding
elif hasattr(trace.stats, "mseed") and hasattr(trace.stats.mseed, "encoding"):
mseed_encoding = stats.mseed.encoding
# Check if the encoding is valid.
if isinstance(mseed_encoding, int) and mseed_encoding in ENCODINGS:
trace_attr["encoding"] = mseed_encoding
elif isinstance(mseed_encoding, basestring) and mseed_encoding in encoding_strings:
trace_attr["encoding"] = encoding_strings[mseed_encoding]
else:
msg = "Invalid encoding %s in " + "Stream[%i].stats.mseed.encoding. Valid encodings: %s"
raise ValueError(msg % (mseed_encoding, _i, encoding_strings))
# Check if the encoding matches the data's dtype.
if trace.data.dtype.type != ENCODINGS[trace_attr["encoding"]][2]:
msg = (
"The encoding specified in "
+ "trace.stats.mseed.encoding does not match the "
+ "dtype of the data.\nA suitable encoding will "
+ "be chosen."
)
warnings.warn(msg, UserWarning)
trace_attr["encoding"] = None
# automatically detect encoding if no encoding is given.
if not trace_attr["encoding"]:
if trace.data.dtype.type == np.dtype("int32"):
trace_attr["encoding"] = 11
elif trace.data.dtype.type == np.dtype("float32"):
trace_attr["encoding"] = 4
elif trace.data.dtype.type == np.dtype("float64"):
trace_attr["encoding"] = 5
elif trace.data.dtype.type == np.dtype("int16"):
trace_attr["encoding"] = 1
elif trace.data.dtype.type == np.dtype("|S1").type:
trace_attr["encoding"] = 0
else:
msg = "Unsupported data type %s in Stream[%i].data" % (trace.data.dtype, _i)
raise Exception(msg)
# Convert data if necessary, otherwise store references in list.
if trace_attr["encoding"] == 1:
# INT16 needs INT32 data type
trace_data.append(trace.data.copy().astype(np.int32))
else:
trace_data.append(trace.data)
# Do some final sanity checks and raise a warning if a file will be written
# with more than one different encoding, record length or byteorder.
encodings = set([_i["encoding"] for _i in trace_attributes])
reclens = set([_i["reclen"] for _i in trace_attributes])
byteorders = set([_i["byteorder"] for _i in trace_attributes])
msg = (
"File will be written with more than one different %s.\n"
+ "This might have a negative influence on the compatibility "
+ "with other programs."
)
if len(encodings) != 1:
warnings.warn(msg % "encodings")
if len(reclens) != 1:
warnings.warn(msg % "record lengths")
if len(byteorders) != 1:
warnings.warn(msg % "byteorders")
# Open filehandler or use an existing file like object.
if not hasattr(filename, "write"):
f = open(filename, "wb")
else:
f = filename
# Loop over every trace and finally write it to the filehandler.
for trace, data, trace_attr in izip(stream, trace_data, trace_attributes):
# Create C struct MSTraceGroup.
mstg = MSTG(trace, data, dataquality=trace_attr["dataquality"])
# Initialize packedsamples pointer for the mst_pack function
packedsamples = C.c_int()
# Callback function for mst_pack to actually write the file
def record_handler(record, reclen, _stream):
f.write(record[0:reclen])
# Define Python callback function for use in C function
recHandler = C.CFUNCTYPE(C.c_void_p, C.POINTER(C.c_char), C.c_int, C.c_void_p)(record_handler)
# Fill up msr record structure, this is already contained in
# mstg, however if blk1001 is set we need it anyway
msr = clibmseed.msr_init(None)
msr.contents.network = trace.stats.network
msr.contents.station = trace.stats.station
msr.contents.location = trace.stats.location
msr.contents.channel = trace.stats.channel
msr.contents.dataquality = trace_attr["dataquality"]
# Only use Blockette 1001 if necessary.
if use_blkt_1001:
size = C.sizeof(blkt_1001_s)
blkt1001 = C.c_char(" ")
C.memset(C.pointer(blkt1001), 0, size)
ret_val = clibmseed.msr_addblockette(msr, C.pointer(blkt1001), size, 1001, 0)
# Usually returns a pointer to the added blockette in the
# blockette link chain and a NULL pointer if it fails.
# NULL pointers have a false boolean value according to the
# ctypes manual.
if bool(ret_val) is False:
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
raise Exception("Error in msr_addblockette")
# Only use Blockette 100 if necessary.
if use_blkt_100:
size = C.sizeof(blkt_100_s)
blkt100 = C.c_char(" ")
C.memset(C.pointer(blkt100), 0, size)
ret_val = clibmseed.msr_addblockette(msr, C.pointer(blkt100), size, 100, 0)
# Usually returns a pointer to the added blockette in the
# blockette link chain and a NULL pointer if it fails.
# NULL pointers have a false boolean value according to the
# ctypes manual.
if bool(ret_val) is False:
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
raise Exception("Error in msr_addblockette")
# Pack mstg into a MSEED file using the callback record_handler as
# write method.
errcode = clibmseed.mst_packgroup(
mstg.getMstg(),
recHandler,
None,
trace_attr["reclen"],
trace_attr["encoding"],
trace_attr["byteorder"],
C.byref(packedsamples),
flush,
verbose,
msr,
)
if errcode == 0:
msg = 'Skipping empty trace "%s".' % (trace)
warnings.warn(msg)
if errcode == -1:
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
raise Exception("Error in mst_packgroup")
# Deallocate any allocated memory.
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
# Close if its a file handler.
if isinstance(f, file):
f.close()
def readMSEED(
mseed_object, starttime=None, endtime=None, headonly=False, sourcename=None, reclen=None, recinfo=True, **kwargs
):
"""
Reads a Mini-SEED file and returns a Stream object.
.. warning::
This function should NOT be called directly, it registers via the
ObsPy :func:`~obspy.core.stream.read` function, call this instead.
:param mseed_object: Filename or open file like object that contains the
binary Mini-SEED data. Any object that provides a read() method will be
considered to be a file like object.
:type starttime: UTCDateTime
:param starttime: Only read data samples after or at the starttime.
:type endtime: UTCDateTime
:param endtime: Only read data samples before or at the starttime.
:param headonly: Determines whether or not to unpack the data or just
read the headers.
:type sourcename: str
:param sourcename: Sourcename has to have the structure
'network.station.location.channel' and can contain globbing characters.
Defaults to ``None``.
:param reclen: If it is None, it will be automatically determined for every
record. If it is known, just set it to the record length in bytes which
will increase the reading speed slightly.
:type recinfo: bool, optional
:param recinfo: If ``True`` the byteorder, record length and the
encoding of the file will be read and stored in every Trace's
stats.mseed AttribDict. These stored attributes will also be used while
writing a Mini-SEED file. Only the very first record of the file will
be read and all following records are assumed to be the same. Defaults
to ``True``.
.. rubric:: Example
>>> from obspy.core import read
>>> st = read("/path/to/two_channels.mseed")
>>> print(st) # doctest: +ELLIPSIS
2 Trace(s) in Stream:
BW.UH3..EHE | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
BW.UH3..EHZ | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
>>> from obspy.core import UTCDateTime
>>> st = read("/path/to/test.mseed",
... starttime=UTCDateTime("2003-05-29T02:16:00"),
... selection="NL.*.*.?HZ")
>>> print(st) # doctest: +ELLIPSIS
1 Trace(s) in Stream:
NL.HGN.00.BHZ | 2003-05-29T02:15:59.993400Z - ... | 40.0 Hz, 5629 samples
"""
# Parse the headonly and reclen flags.
if headonly is True:
unpack_data = 0
else:
unpack_data = 1
if reclen is None:
reclen = -1
elif reclen is not None and reclen not in VALID_RECORD_LENGTHS:
msg = "Invalid record length. Autodetection will be used."
warnings.warn(msg)
reclen = -1
else:
reclen = int(log(reclen, 2))
# The quality flag is no more supported. Raise a warning.
if "quality" in kwargs:
msg = (
"The quality flag is no more supported in this version of "
+ "obspy.mseed. obspy.mseed.util has some functions with similar "
+ "behaviour."
)
warnings.warn(msg, category=DeprecationWarning)
# Parse some information about the file.
if recinfo:
info = util.getRecordInformation(mseed_object)
info["encoding"] = ENCODINGS[info["encoding"]][0]
# Only keep information relevant for the whole file.
info = {
"encoding": info["encoding"],
"filesize": info["filesize"],
"record_length": info["record_length"],
"byteorder": info["byteorder"],
"number_of_records": info["number_of_records"],
}
# If its a filename just read it.
if isinstance(mseed_object, basestring):
# Read to NumPy array which is used as a buffer.
buffer = np.fromfile(mseed_object, dtype="b")
elif hasattr(mseed_object, "read"):
buffer = np.fromstring(mseed_object.read(), dtype="b")
# Get the record length
try:
record_length = pow(2, int("".join([chr(_i) for _i in buffer[19:21]])))
except ValueError:
record_length = 4096
# Search for data records and pass only the data part to the underlying C
# routine.
offset = 0
# 0 to 9 are defined in a row in the ASCII charset.
min_ascii = ord("0")
# Small function to check whether an array of ASCII values contains only
# digits.
isdigit = lambda x: True if (x - min_ascii).max() <= 9 else False
while True:
# This should never happen
if (isdigit(buffer[offset : offset + 6]) is False) or (buffer[offset + 6] not in VALID_CONTROL_HEADERS):
msg = "Not a valid (Mini-)SEED file"
raise Exception(msg)
elif buffer[offset + 6] in SEED_CONTROL_HEADERS:
offset += record_length
continue
break
buffer = buffer[offset:]
buflen = len(buffer)
# If no selection is given pass None to the C function.
if starttime is None and endtime is None and sourcename is None:
selections = None
else:
select_time = SelectTime()
selections = Selections()
selections.timewindows.contents = select_time
if starttime is not None:
if not isinstance(starttime, UTCDateTime):
msg = "starttime needs to be a UTCDateTime object"
raise ValueError(msg)
selections.timewindows.contents.starttime = util._convertDatetimeToMSTime(starttime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.starttime = HPTERROR
if endtime is not None:
if not isinstance(endtime, UTCDateTime):
msg = "endtime needs to be a UTCDateTime object"
raise ValueError(msg)
selections.timewindows.contents.endtime = util._convertDatetimeToMSTime(endtime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.endtime = HPTERROR
if sourcename is not None:
if not isinstance(sourcename, basestring):
msg = "sourcename needs to be a string"
raise ValueError(msg)
# libmseed uses underscores as separators and allows filtering
# after the dataquality which is disabled here to not confuse
# users. (* == all data qualities)
selections.srcname = sourcename.replace(".", "_") + "_*"
else:
selections.srcname = "*"
all_data = []
# Use a callback function to allocate the memory and keep track of the
# data.
def allocate_data(samplecount, sampletype):
data = np.empty(samplecount, dtype=DATATYPES[sampletype])
all_data.append(data)
return data.ctypes.data
# XXX: Do this properly!
# Define Python callback function for use in C function. Return a long so
# it hopefully works on 32 and 64 bit systems.
allocData = C.CFUNCTYPE(C.c_long, C.c_int, C.c_char)(allocate_data)
lil = clibmseed.readMSEEDBuffer(buffer, buflen, selections, unpack_data, reclen, 0, allocData)
# XXX: Check if the freeing works.
del selections
traces = []
try:
currentID = lil.contents
# Return stream if not traces are found.
except ValueError:
clibmseed.lil_free(lil)
del lil
return Stream()
while True:
# Init header with the essential information.
header = {
"network": currentID.network.strip(),
"station": currentID.station.strip(),
"location": currentID.location.strip(),
"channel": currentID.channel.strip(),
"mseed": {"dataquality": currentID.dataquality},
}
# Loop over segments.
try:
currentSegment = currentID.firstSegment.contents
except ValueError:
break
while True:
header["sampling_rate"] = currentSegment.samprate
header["starttime"] = util._convertMSTimeToDatetime(currentSegment.starttime)
if headonly is False:
# The data always will be in sequential order.
data = all_data.pop(0)
header["npts"] = len(data)
else:
data = np.array([])
header["npts"] = currentSegment.samplecnt
# Make sure to init the number of samples.
trace = Trace(header=header, data=data)
# Append information if necessary.
if recinfo:
for key, value in info.iteritems():
setattr(trace.stats.mseed, key, value)
traces.append(trace)
# A Null pointer access results in a ValueError
try:
currentSegment = currentSegment.next.contents
except ValueError:
break
try:
currentID = currentID.next.contents
except ValueError:
break
clibmseed.lil_free(lil)
del lil
return Stream(traces=traces)
def readMSEED(mseed_object,
starttime=None,
endtime=None,
headonly=False,
sourcename=None,
reclen=None,
recinfo=True,
**kwargs):
"""
Reads a Mini-SEED file and returns a Stream object.
.. warning::
This function should NOT be called directly, it registers via the
ObsPy :func:`~obspy.core.stream.read` function, call this instead.
:param mseed_object: Filename or open file like object that contains the
binary Mini-SEED data. Any object that provides a read() method will be
considered to be a file like object.
:type starttime: UTCDateTime
:param starttime: Only read data samples after or at the starttime.
:type endtime: UTCDateTime
:param endtime: Only read data samples before or at the starttime.
:param headonly: Determines whether or not to unpack the data or just
read the headers.
:type sourcename: str
:param sourcename: Sourcename has to have the structure
'network.station.location.channel' and can contain globbing characters.
Defaults to ``None``.
:param reclen: If it is None, it will be automatically determined for every
record. If it is known, just set it to the record length in bytes which
will increase the reading speed slightly.
:type recinfo: bool, optional
:param recinfo: If ``True`` the byteorder, record length and the
encoding of the file will be read and stored in every Trace's
stats.mseed AttribDict. These stored attributes will also be used while
writing a Mini-SEED file. Only the very first record of the file will
be read and all following records are assumed to be the same. Defaults
to ``True``.
.. rubric:: Example
>>> from obspy.core import read
>>> st = read("/path/to/two_channels.mseed")
>>> print(st) # doctest: +ELLIPSIS
2 Trace(s) in Stream:
BW.UH3..EHE | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
BW.UH3..EHZ | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
>>> from obspy.core import UTCDateTime
>>> st = read("/path/to/test.mseed",
... starttime=UTCDateTime("2003-05-29T02:16:00"),
... selection="NL.*.*.?HZ")
>>> print(st) # doctest: +ELLIPSIS
1 Trace(s) in Stream:
NL.HGN.00.BHZ | 2003-05-29T02:15:59.993400Z - ... | 40.0 Hz, 5629 samples
"""
# Parse the headonly and reclen flags.
if headonly is True:
unpack_data = 0
else:
unpack_data = 1
if reclen is None:
reclen = -1
elif reclen is not None and reclen not in VALID_RECORD_LENGTHS:
msg = 'Invalid record length. Autodetection will be used.'
warnings.warn(msg)
reclen = -1
else:
reclen = int(log(reclen, 2))
# The quality flag is no more supported. Raise a warning.
if 'quality' in kwargs:
msg = 'The quality flag is no more supported in this version of ' + \
'obspy.mseed. obspy.mseed.util has some functions with similar ' + \
'behaviour.'
warnings.warn(msg, category=DeprecationWarning)
# Parse some information about the file.
if recinfo:
info = util.getRecordInformation(mseed_object)
info['encoding'] = ENCODINGS[info['encoding']][0]
# Only keep information relevant for the whole file.
info = {
'encoding': info['encoding'],
'filesize': info['filesize'],
'record_length': info['record_length'],
'byteorder': info['byteorder'],
'number_of_records': info['number_of_records']
}
# If its a filename just read it.
if isinstance(mseed_object, basestring):
# Read to NumPy array which is used as a buffer.
buffer = np.fromfile(mseed_object, dtype='b')
elif hasattr(mseed_object, 'read'):
buffer = np.fromstring(mseed_object.read(), dtype='b')
# Get the record length
try:
record_length = pow(2, int(''.join([chr(_i) for _i in buffer[19:21]])))
except ValueError:
record_length = 4096
# Search for data records and pass only the data part to the underlying C
# routine.
offset = 0
# 0 to 9 are defined in a row in the ASCII charset.
min_ascii = ord('0')
# Small function to check whether an array of ASCII values contains only
# digits.
isdigit = lambda x: True if (x - min_ascii).max() <= 9 else False
while True:
# This should never happen
if (isdigit(buffer[offset:offset + 6]) is False) or \
(buffer[offset + 6] not in VALID_CONTROL_HEADERS):
msg = 'Not a valid (Mini-)SEED file'
raise Exception(msg)
elif buffer[offset + 6] in SEED_CONTROL_HEADERS:
offset += record_length
continue
break
buffer = buffer[offset:]
buflen = len(buffer)
# If no selection is given pass None to the C function.
if starttime is None and endtime is None and sourcename is None:
selections = None
else:
select_time = SelectTime()
selections = Selections()
selections.timewindows.contents = select_time
if starttime is not None:
if not isinstance(starttime, UTCDateTime):
msg = 'starttime needs to be a UTCDateTime object'
raise ValueError(msg)
selections.timewindows.contents.starttime = \
util._convertDatetimeToMSTime(starttime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.starttime = HPTERROR
if endtime is not None:
if not isinstance(endtime, UTCDateTime):
msg = 'endtime needs to be a UTCDateTime object'
raise ValueError(msg)
selections.timewindows.contents.endtime = \
util._convertDatetimeToMSTime(endtime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.endtime = HPTERROR
if sourcename is not None:
if not isinstance(sourcename, basestring):
msg = 'sourcename needs to be a string'
raise ValueError(msg)
# libmseed uses underscores as separators and allows filtering
# after the dataquality which is disabled here to not confuse
# users. (* == all data qualities)
selections.srcname = sourcename.replace('.', '_') + '_*'
else:
selections.srcname = '*'
all_data = []
# Use a callback function to allocate the memory and keep track of the
# data.
def allocate_data(samplecount, sampletype):
data = np.empty(samplecount, dtype=DATATYPES[sampletype])
all_data.append(data)
return data.ctypes.data
# XXX: Do this properly!
# Define Python callback function for use in C function. Return a long so
# it hopefully works on 32 and 64 bit systems.
allocData = C.CFUNCTYPE(C.c_long, C.c_int, C.c_char)(allocate_data)
lil = clibmseed.readMSEEDBuffer(buffer, buflen, selections, unpack_data,
reclen, 0, allocData)
# XXX: Check if the freeing works.
del selections
traces = []
try:
currentID = lil.contents
# Return stream if not traces are found.
except ValueError:
clibmseed.lil_free(lil)
del lil
return Stream()
while True:
# Init header with the essential information.
header = {
'network': currentID.network.strip(),
'station': currentID.station.strip(),
'location': currentID.location.strip(),
'channel': currentID.channel.strip(),
'mseed': {
'dataquality': currentID.dataquality
}
}
# Loop over segments.
try:
currentSegment = currentID.firstSegment.contents
except ValueError:
break
while True:
header['sampling_rate'] = currentSegment.samprate
header['starttime'] = \
util._convertMSTimeToDatetime(currentSegment.starttime)
if headonly is False:
# The data always will be in sequential order.
data = all_data.pop(0)
header['npts'] = len(data)
else:
data = np.array([])
header['npts'] = currentSegment.samplecnt
# Make sure to init the number of samples.
trace = Trace(header=header, data=data)
# Append information if necessary.
if recinfo:
for key, value in info.iteritems():
setattr(trace.stats.mseed, key, value)
traces.append(trace)
# A Null pointer access results in a ValueError
try:
currentSegment = currentSegment.next.contents
except ValueError:
break
try:
currentID = currentID.next.contents
except ValueError:
break
clibmseed.lil_free(lil)
del lil
return Stream(traces=traces)
def writeMSEED(stream,
filename,
encoding=None,
reclen=None,
byteorder=None,
flush=1,
verbose=0,
**_kwargs):
"""
Write Mini-SEED file from a Stream object.
.. warning::
This function should NOT be called directly, it registers via the
the :meth:`~obspy.core.stream.Stream.write` method of an
ObsPy :class:`~obspy.core.stream.Stream` object, call this instead.
:type stream: :class:`~obspy.core.stream.Stream`
:param stream: A Stream object.
:type filename: str
:param filename: Name of the output file
:type encoding: int or str, optional
:param encoding: Should be set to one of the following supported Mini-SEED
data encoding formats: ASCII (``0``)*, INT16 (``1``), INT32 (``3``),
FLOAT32 (``4``)*, FLOAT64 (``5``)*, STEIM1 (``10``) and STEIM2
(``11``)*. Default data types a marked with an asterisk. Currently
INT24 (``2``) is not supported due to lacking NumPy support.
:type reclen: int, optional
:param reclen: Should be set to the desired data record length in bytes
which must be expressible as 2 raised to the power of X where X is
between (and including) 8 to 20.
Defaults to 4096
:type byteorder: [``0`` or ``'<'`` | ``1`` or ``'>'`` | ``'='``], optional
:param byteorder: Must be either ``0`` or ``'<'`` for LSBF or
little-endian, ``1`` or ``'>'`` for MBF or big-endian. ``'='`` is the
native byteorder. If ``-1`` it will be passed directly to libmseed
which will also default it to big endian. Defaults to big endian.
:type flush: int, optional
:param flush: If it is not zero all of the data will be packed into
records, otherwise records will only be packed while there are
enough data samples to completely fill a record.
:type verbose: int, optional
:param verbose: Controls verbosity, a value of zero will result in no
diagnostic output.
.. note::
The reclen, encoding and byteorder keyword arguments can be set
in the stats.mseed of each :class:`~obspy.core.trace.Trace` as well as
as kwargs of this function. If both are given the kwargs will be used.
.. rubric:: Example
>>> from obspy.core import read
>>> st = read()
>>> st.write('filename.mseed', format='MSEED') # doctest: +SKIP
"""
# Some sanity checks for the keyword arguments.
if reclen is not None and reclen not in VALID_RECORD_LENGTHS:
msg = 'Invalid record length. The record length must be a value\n' + \
'of 2 to the power of X where 8 <= X <= 20.'
raise ValueError(msg)
if byteorder is not None and byteorder not in [0, 1, -1]:
if byteorder == '=':
byteorder = NATIVE_BYTEORDER
# If not elif because NATIVE_BYTEORDER is '<' or '>'.
if byteorder == '<':
byteorder = 0
elif byteorder == '>':
byteorder = 1
else:
msg = "Invalid byteorder. It must be either '<', '>', '=', " + \
"0, 1 or -1"
raise ValueError(msg)
# Check if encoding kwarg is set and catch invalid encodings.
# XXX: Currently INT24 is not working due to lacking NumPy support.
encoding_strings = dict([(v[0], k) for (k, v) in ENCODINGS.iteritems()])
if encoding is not None:
if isinstance(encoding, int) and encoding in ENCODINGS:
pass
elif encoding and isinstance(encoding, basestring) and encoding \
in encoding_strings:
encoding = encoding_strings[encoding]
else:
msg = 'Invalid encoding %s. Valid encodings: %s'
raise ValueError(msg % (encoding, encoding_strings))
trace_attributes = []
use_blkt_1001 = 0
# The data might need to be modified. To not modify the input data keep
# references of which data to finally write.
trace_data = []
# Loop over every trace and figure out the correct settings.
for _i, trace in enumerate(stream):
# Create temporary dict for storing information while writing.
trace_attr = {}
trace_attributes.append(trace_attr)
stats = trace.stats
# Figure out whether or not to use Blockette 1001. This check is done
# once to ensure that Blockette 1001 is either written for every record
# in the file or for none. It checks the starttime as well as the
# sampling rate. If either one has a precision of more than 100
# microseconds, Blockette 1001 will be written for every record.
starttime = util._convertDatetimeToMSTime(trace.stats.starttime)
if starttime % 100 != 0 or \
(1.0 / trace.stats.sampling_rate * HPTMODULUS) % 100 != 0:
use_blkt_1001 += 1
# Determine if a blockette 100 will be needed to represent the input
# sample rate or if the sample rate in the fixed section of the data
# header will suffice (see ms_genfactmult in libmseed/genutils.c)
if trace.stats.sampling_rate >= 32727.0 or \
trace.stats.sampling_rate <= (1.0 / 32727.0):
use_blkt_100 = True
else:
use_blkt_100 = False
# Set data quality to indeterminate (= D) if it is not already set.
try:
trace_attr['dataquality'] = \
trace.stats['mseed']['dataquality'].upper()
except:
trace_attr['dataquality'] = 'D'
# Sanity check for the dataquality to get a nice Python exception
# instead of a C error.
if trace_attr['dataquality'] not in ['D', 'R', 'Q', 'M']:
msg = 'Invalid dataquality in Stream[%i].stats' % _i + \
'.mseed.dataquality\n' + \
'The dataquality for Mini-SEED must be either D, R, Q ' + \
'or M. See the SEED manual for further information.'
raise ValueError(msg)
# Check that data is of the right type.
if not isinstance(trace.data, np.ndarray):
msg = "Unsupported data type %s" % type(trace.data) + \
" for Stream[%i].data." % _i
raise ValueError(msg)
# Check if ndarray is contiguous (see #192, #193)
if not trace.data.flags.c_contiguous:
msg = "Detected non contiguous data array in Stream[%i]" % _i + \
".data. Trying to fix array."
warnings.warn(msg)
trace.data = np.require(trace.data,
requirements=('C_CONTIGUOUS', ))
# Handle the record length.
if reclen is not None:
trace_attr['reclen'] = reclen
elif hasattr(stats, 'mseed') and \
hasattr(stats.mseed, 'record_length'):
if stats.mseed.record_length in VALID_RECORD_LENGTHS:
trace_attr['reclen'] = stats.mseed.record_length
else:
msg = 'Invalid record length in Stream[%i].stats.' % _i + \
'mseed.reclen.\nThe record length must be a value ' + \
'of 2 to the power of X where 8 <= X <= 20.'
raise ValueError(msg)
else:
trace_attr['reclen'] = 4096
# Handle the byteorder.
if byteorder is not None:
trace_attr['byteorder'] = byteorder
elif hasattr(stats, 'mseed') and \
hasattr(stats.mseed, 'byteorder'):
if stats.mseed.byteorder in [0, 1, -1]:
trace_attr['byteorder'] = stats.mseed.byteorder
elif stats.mseed.byteorder == '=':
if NATIVE_BYTEORDER == '<':
trace_attr['byteorder'] = 0
else:
trace_attr['byteorder'] = 1
elif stats.mseed.byteorder == '<':
trace_attr['byteorder'] = 0
elif stats.mseed.byteorder == '>':
trace_attr['byteorder'] = 1
else:
msg = "Invalid byteorder in Stream[%i].stats." % _i + \
"mseed.byteorder. It must be either '<', '>', '='," + \
" 0, 1 or -1"
raise ValueError(msg)
else:
trace_attr['byteorder'] = 1
if trace_attr['byteorder'] == -1:
if NATIVE_BYTEORDER == '<':
trace_attr['byteorder'] = 0
else:
trace_attr['byteorder'] = 1
# Handle the encoding.
trace_attr['encoding'] = None
if encoding is not None:
# Check if the dtype for all traces is compatible with the enforced
# encoding.
id, _, dtype = ENCODINGS[encoding]
if trace.data.dtype.type != dtype:
msg = """
Wrong dtype for Stream[%i].data for encoding %s.
Please change the dtype of your data or use an appropriate
encoding. See the obspy.mseed documentation for more
information.
""" % (_i, id)
raise Exception(msg)
trace_attr['encoding'] = encoding
elif hasattr(trace.stats, 'mseed') and hasattr(trace.stats.mseed,
'encoding'):
mseed_encoding = stats.mseed.encoding
# Check if the encoding is valid.
if isinstance(mseed_encoding, int) and mseed_encoding in ENCODINGS:
trace_attr['encoding'] = mseed_encoding
elif isinstance(mseed_encoding, basestring) and \
mseed_encoding in encoding_strings:
trace_attr['encoding'] = encoding_strings[mseed_encoding]
else:
msg = 'Invalid encoding %s in ' + \
'Stream[%i].stats.mseed.encoding. Valid encodings: %s'
raise ValueError(msg % (mseed_encoding, _i, encoding_strings))
# Check if the encoding matches the data's dtype.
if trace.data.dtype.type != ENCODINGS[trace_attr['encoding']][2]:
msg = 'The encoding specified in ' + \
'trace.stats.mseed.encoding does not match the ' + \
'dtype of the data.\nA suitable encoding will ' + \
'be chosen.'
warnings.warn(msg, UserWarning)
trace_attr['encoding'] = None
# automatically detect encoding if no encoding is given.
if not trace_attr['encoding']:
if trace.data.dtype.type == np.dtype("int32"):
trace_attr['encoding'] = 11
elif trace.data.dtype.type == np.dtype("float32"):
trace_attr['encoding'] = 4
elif trace.data.dtype.type == np.dtype("float64"):
trace_attr['encoding'] = 5
elif trace.data.dtype.type == np.dtype("int16"):
trace_attr['encoding'] = 1
elif trace.data.dtype.type == np.dtype('|S1').type:
trace_attr['encoding'] = 0
else:
msg = "Unsupported data type %s in Stream[%i].data" % \
(trace.data.dtype, _i)
raise Exception(msg)
# Convert data if necessary, otherwise store references in list.
if trace_attr['encoding'] == 1:
# INT16 needs INT32 data type
trace_data.append(trace.data.copy().astype(np.int32))
else:
trace_data.append(trace.data)
# Do some final sanity checks and raise a warning if a file will be written
# with more than one different encoding, record length or byteorder.
encodings = set([_i['encoding'] for _i in trace_attributes])
reclens = set([_i['reclen'] for _i in trace_attributes])
byteorders = set([_i['byteorder'] for _i in trace_attributes])
msg = 'File will be written with more than one different %s.\n' + \
'This might have a negative influence on the compatibility ' + \
'with other programs.'
if len(encodings) != 1:
warnings.warn(msg % 'encodings')
if len(reclens) != 1:
warnings.warn(msg % 'record lengths')
if len(byteorders) != 1:
warnings.warn(msg % 'byteorders')
# Open filehandler or use an existing file like object.
if not hasattr(filename, 'write'):
f = open(filename, 'wb')
else:
f = filename
# Loop over every trace and finally write it to the filehandler.
for trace, data, trace_attr in izip(stream, trace_data, trace_attributes):
# Create C struct MSTraceGroup.
mstg = MSTG(trace, data, dataquality=trace_attr['dataquality'])
# Initialize packedsamples pointer for the mst_pack function
packedsamples = C.c_int()
# Callback function for mst_pack to actually write the file
def record_handler(record, reclen, _stream):
f.write(record[0:reclen])
# Define Python callback function for use in C function
recHandler = C.CFUNCTYPE(C.c_void_p, C.POINTER(C.c_char), C.c_int,
C.c_void_p)(record_handler)
# Fill up msr record structure, this is already contained in
# mstg, however if blk1001 is set we need it anyway
msr = clibmseed.msr_init(None)
msr.contents.network = trace.stats.network
msr.contents.station = trace.stats.station
msr.contents.location = trace.stats.location
msr.contents.channel = trace.stats.channel
msr.contents.dataquality = trace_attr['dataquality']
# Only use Blockette 1001 if necessary.
if use_blkt_1001:
size = C.sizeof(blkt_1001_s)
blkt1001 = C.c_char(' ')
C.memset(C.pointer(blkt1001), 0, size)
ret_val = clibmseed.msr_addblockette(msr, C.pointer(blkt1001),
size, 1001, 0)
# Usually returns a pointer to the added blockette in the
# blockette link chain and a NULL pointer if it fails.
# NULL pointers have a false boolean value according to the
# ctypes manual.
if bool(ret_val) is False:
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
raise Exception('Error in msr_addblockette')
# Only use Blockette 100 if necessary.
if use_blkt_100:
size = C.sizeof(blkt_100_s)
blkt100 = C.c_char(' ')
C.memset(C.pointer(blkt100), 0, size)
ret_val = clibmseed.msr_addblockette(msr, C.pointer(blkt100), size,
100, 0)
# Usually returns a pointer to the added blockette in the
# blockette link chain and a NULL pointer if it fails.
# NULL pointers have a false boolean value according to the
# ctypes manual.
if bool(ret_val) is False:
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
raise Exception('Error in msr_addblockette')
# Pack mstg into a MSEED file using the callback record_handler as
# write method.
errcode = clibmseed.mst_packgroup(mstg.getMstg(), recHandler, None,
trace_attr['reclen'],
trace_attr['encoding'],
trace_attr['byteorder'],
C.byref(packedsamples), flush,
verbose, msr)
if errcode == 0:
msg = 'Skipping empty trace "%s".' % (trace)
warnings.warn(msg)
if errcode == -1:
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
raise Exception('Error in mst_packgroup')
# Deallocate any allocated memory.
clibmseed.msr_free(C.pointer(msr))
del mstg, msr
# Close if its a file handler.
if isinstance(f, file):
f.close()
def readMSEED(mseed_object,
starttime=None,
endtime=None,
headonly=False,
sourcename=None,
reclen=None,
recinfo=True,
details=False,
header_byteorder=None,
verbose=None,
**kwargs):
"""
Reads a Mini-SEED file and returns a Stream object.
.. warning::
This function should NOT be called directly, it registers via the
ObsPy :func:`~obspy.core.stream.read` function, call this instead.
:param mseed_object: Filename or open file like object that contains the
binary Mini-SEED data. Any object that provides a read() method will be
considered to be a file like object.
:type starttime: UTCDateTime
:param starttime: Only read data samples after or at the starttime.
:type endtime: UTCDateTime
:param endtime: Only read data samples before or at the starttime.
:param headonly: Determines whether or not to unpack the data or just
read the headers.
:type sourcename: str
:param sourcename: Sourcename has to have the structure
'network.station.location.channel' and can contain globbing characters.
Defaults to ``None``.
:param reclen: If it is None, it will be automatically determined for every
record. If it is known, just set it to the record length in bytes which
will increase the reading speed slightly.
:type recinfo: bool, optional
:param recinfo: If ``True`` the byteorder, record length and the
encoding of the file will be read and stored in every Trace's
stats.mseed AttribDict. These stored attributes will also be used while
writing a Mini-SEED file. Only the very first record of the file will
be read and all following records are assumed to be the same. Defaults
to ``True``.
:type details: bool, optional
:param details: If ``True`` read additional information: timing quality
and availability of calibration information.
Note, that the traces are then also split on these additional
information. Thus the number of traces in a stream will change.
Details are stored in the mseed stats AttribDict of each trace.
-1 specifies for both cases, that these information is not available.
``timing_quality`` specifies the timing quality from 0 to 100 [%].
``calibration_type`` specifies the type of available calibration
information: 1 == Step Calibration, 2 == Sine Calibration, 3 ==
Pseudo-random Calibration, 4 == Generic Calibration and -2 ==
Calibration Abort.
:type header_byteorder: [``0`` or ``'<'`` | ``1`` or ``'>'`` | ``'='``],
optional
:param header_byteorder: Must be either ``0`` or ``'<'`` for LSBF or
little-endian, ``1`` or ``'>'`` for MBF or big-endian. ``'='`` is the
native byteorder. Used to enforce the header byteorder. Useful in some
rare cases where the automatic byte order detection fails.
.. rubric:: Example
>>> from obspy import read
>>> st = read("/path/to/two_channels.mseed")
>>> print(st) # doctest: +ELLIPSIS
2 Trace(s) in Stream:
BW.UH3..EHE | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
BW.UH3..EHZ | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
>>> from obspy import UTCDateTime
>>> st = read("/path/to/test.mseed",
... starttime=UTCDateTime("2003-05-29T02:16:00"),
... selection="NL.*.*.?HZ")
>>> print(st) # doctest: +ELLIPSIS
1 Trace(s) in Stream:
NL.HGN.00.BHZ | 2003-05-29T02:15:59.993400Z - ... | 40.0 Hz, 5629 samples
"""
# Parse the headonly and reclen flags.
if headonly is True:
unpack_data = 0
else:
unpack_data = 1
if reclen is None:
reclen = -1
elif reclen not in VALID_RECORD_LENGTHS:
msg = 'Invalid record length. Autodetection will be used.'
warnings.warn(msg)
reclen = -1
# Determine the byteorder.
if header_byteorder == "=":
header_byteorder = NATIVE_BYTEORDER
if header_byteorder is None:
header_byteorder = -1
elif header_byteorder in [0, "0", "<"]:
header_byteorder = 0
elif header_byteorder in [1, "1", ">"]:
header_byteorder = 1
# The quality flag is no more supported. Raise a warning.
if 'quality' in kwargs:
msg = 'The quality flag is no more supported in this version of ' + \
'obspy.mseed. obspy.mseed.util has some functions with similar' + \
' behaviour.'
warnings.warn(msg, category=DeprecationWarning)
# Parse some information about the file.
if recinfo:
# Pass the byteorder if enforced.
if header_byteorder == 0:
bo = "<"
elif header_byteorder > 0:
bo = ">"
else:
bo = None
info = util.getRecordInformation(mseed_object, endian=bo)
info['encoding'] = ENCODINGS[info['encoding']][0]
# Only keep information relevant for the whole file.
info = {
'encoding': info['encoding'],
'filesize': info['filesize'],
'record_length': info['record_length'],
'byteorder': info['byteorder'],
'number_of_records': info['number_of_records']
}
# If its a filename just read it.
if isinstance(mseed_object, basestring):
# Read to NumPy array which is used as a buffer.
buffer = np.fromfile(mseed_object, dtype='b')
elif hasattr(mseed_object, 'read'):
buffer = np.fromstring(mseed_object.read(), dtype='b')
# Get the record length
try:
record_length = pow(2, int(''.join([chr(_i) for _i in buffer[19:21]])))
except ValueError:
record_length = 4096
# Search for data records and pass only the data part to the underlying C
# routine.
offset = 0
# 0 to 9 are defined in a row in the ASCII charset.
min_ascii = ord('0')
# Small function to check whether an array of ASCII values contains only
# digits.
isdigit = lambda x: True if (x - min_ascii).max() <= 9 else False
while True:
# This should never happen
if (isdigit(buffer[offset:offset + 6]) is False) or \
(buffer[offset + 6] not in VALID_CONTROL_HEADERS):
msg = 'Not a valid (Mini-)SEED file'
raise Exception(msg)
elif buffer[offset + 6] in SEED_CONTROL_HEADERS:
offset += record_length
continue
break
buffer = buffer[offset:]
buflen = len(buffer)
# If no selection is given pass None to the C function.
if starttime is None and endtime is None and sourcename is None:
selections = None
else:
select_time = SelectTime()
selections = Selections()
selections.timewindows.contents = select_time
if starttime is not None:
if not isinstance(starttime, UTCDateTime):
msg = 'starttime needs to be a UTCDateTime object'
raise ValueError(msg)
selections.timewindows.contents.starttime = \
util._convertDatetimeToMSTime(starttime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.starttime = HPTERROR
if endtime is not None:
if not isinstance(endtime, UTCDateTime):
msg = 'endtime needs to be a UTCDateTime object'
raise ValueError(msg)
selections.timewindows.contents.endtime = \
util._convertDatetimeToMSTime(endtime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.endtime = HPTERROR
if sourcename is not None:
if not isinstance(sourcename, basestring):
msg = 'sourcename needs to be a string'
raise ValueError(msg)
# libmseed uses underscores as separators and allows filtering
# after the dataquality which is disabled here to not confuse
# users. (* == all data qualities)
selections.srcname = sourcename.replace('.', '_') + '_*'
else:
selections.srcname = '*'
all_data = []
# Use a callback function to allocate the memory and keep track of the
# data.
def allocate_data(samplecount, sampletype):
# Enhanced sanity checking for libmseed 2.10 can result in the
# sampletype not being set. Just return an empty array in this case.
if sampletype == "\x00":
data = np.empty(0)
else:
data = np.empty(samplecount, dtype=DATATYPES[sampletype])
all_data.append(data)
return data.ctypes.data
# XXX: Do this properly!
# Define Python callback function for use in C function. Return a long so
# it hopefully works on 32 and 64 bit systems.
allocData = C.CFUNCTYPE(C.c_long, C.c_int, C.c_char)(allocate_data)
def log_error_or_warning(msg):
if msg.startswith("ERROR: "):
raise InternalMSEEDReadingError(msg[7:].strip())
if msg.startswith("INFO: "):
warnings.warn(msg[6:].strip(), InternalMSEEDReadingWarning)
diag_print = C.CFUNCTYPE(C.c_void_p, C.c_char_p)(log_error_or_warning)
def log_message(msg):
print msg[6:].strip()
log_print = C.CFUNCTYPE(C.c_void_p, C.c_char_p)(log_message)
try:
verbose = int(verbose)
except:
verbose = 0
lil = clibmseed.readMSEEDBuffer(buffer, buflen, selections,
C.c_int8(unpack_data), reclen,
C.c_int8(verbose), C.c_int8(details),
header_byteorder, allocData, diag_print,
log_print)
# XXX: Check if the freeing works.
del selections
traces = []
try:
currentID = lil.contents
# Return stream if not traces are found.
except ValueError:
clibmseed.lil_free(lil)
del lil
return Stream()
while True:
# Init header with the essential information.
header = {
'network': currentID.network.strip(),
'station': currentID.station.strip(),
'location': currentID.location.strip(),
'channel': currentID.channel.strip(),
'mseed': {
'dataquality': currentID.dataquality
}
}
# Loop over segments.
try:
currentSegment = currentID.firstSegment.contents
except ValueError:
break
while True:
header['sampling_rate'] = currentSegment.samprate
header['starttime'] = \
util._convertMSTimeToDatetime(currentSegment.starttime)
# TODO: write support is missing
if details:
timing_quality = currentSegment.timing_quality
if timing_quality == 0xFF: # 0xFF is mask for not known timing
timing_quality = -1
header['mseed']['timing_quality'] = timing_quality
header['mseed']['calibration_type'] = \
currentSegment.calibration_type
if headonly is False:
# The data always will be in sequential order.
data = all_data.pop(0)
header['npts'] = len(data)
else:
data = np.array([])
header['npts'] = currentSegment.samplecnt
# Make sure to init the number of samples.
trace = Trace(header=header, data=data)
# Append information if necessary.
if recinfo:
for key, value in info.iteritems():
setattr(trace.stats.mseed, key, value)
traces.append(trace)
# A Null pointer access results in a ValueError
try:
currentSegment = currentSegment.next.contents
except ValueError:
break
try:
currentID = currentID.next.contents
except ValueError:
break
clibmseed.lil_free(lil) # NOQA
del lil # NOQA
return Stream(traces=traces)
def readMSEED(mseed_object, starttime=None, endtime=None, headonly=False,
sourcename=None, reclen=None, recinfo=True, details=False,
header_byteorder=None, verbose=None, **kwargs):
"""
Reads a Mini-SEED file and returns a Stream object.
.. warning::
This function should NOT be called directly, it registers via the
ObsPy :func:`~obspy.core.stream.read` function, call this instead.
:param mseed_object: Filename or open file like object that contains the
binary Mini-SEED data. Any object that provides a read() method will be
considered to be a file like object.
:type starttime: UTCDateTime
:param starttime: Only read data samples after or at the starttime.
:type endtime: UTCDateTime
:param endtime: Only read data samples before or at the starttime.
:param headonly: Determines whether or not to unpack the data or just
read the headers.
:type sourcename: str
:param sourcename: Sourcename has to have the structure
'network.station.location.channel' and can contain globbing characters.
Defaults to ``None``.
:param reclen: If it is None, it will be automatically determined for every
record. If it is known, just set it to the record length in bytes which
will increase the reading speed slightly.
:type recinfo: bool, optional
:param recinfo: If ``True`` the byteorder, record length and the
encoding of the file will be read and stored in every Trace's
stats.mseed AttribDict. These stored attributes will also be used while
writing a Mini-SEED file. Only the very first record of the file will
be read and all following records are assumed to be the same. Defaults
to ``True``.
:type details: bool, optional
:param details: If ``True`` read additional information: timing quality
and availability of calibration information.
Note, that the traces are then also split on these additional
information. Thus the number of traces in a stream will change.
Details are stored in the mseed stats AttribDict of each trace.
-1 specifies for both cases, that these information is not available.
``timing_quality`` specifies the timing quality from 0 to 100 [%].
``calibration_type`` specifies the type of available calibration
information: 1 == Step Calibration, 2 == Sine Calibration, 3 ==
Pseudo-random Calibration, 4 == Generic Calibration and -2 ==
Calibration Abort.
:type header_byteorder: [``0`` or ``'<'`` | ``1`` or ``'>'`` | ``'='``],
optional
:param header_byteorder: Must be either ``0`` or ``'<'`` for LSBF or
little-endian, ``1`` or ``'>'`` for MBF or big-endian. ``'='`` is the
native byteorder. Used to enforce the header byteorder. Useful in some
rare cases where the automatic byte order detection fails.
.. rubric:: Example
>>> from obspy import read
>>> st = read("/path/to/two_channels.mseed")
>>> print(st) # doctest: +ELLIPSIS
2 Trace(s) in Stream:
BW.UH3..EHE | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
BW.UH3..EHZ | 2010-06-20T00:00:00.279999Z - ... | 200.0 Hz, 386 samples
>>> from obspy import UTCDateTime
>>> st = read("/path/to/test.mseed",
... starttime=UTCDateTime("2003-05-29T02:16:00"),
... selection="NL.*.*.?HZ")
>>> print(st) # doctest: +ELLIPSIS
1 Trace(s) in Stream:
NL.HGN.00.BHZ | 2003-05-29T02:15:59.993400Z - ... | 40.0 Hz, 5629 samples
"""
# Parse the headonly and reclen flags.
if headonly is True:
unpack_data = 0
else:
unpack_data = 1
if reclen is None:
reclen = -1
elif reclen is not None and reclen not in VALID_RECORD_LENGTHS:
msg = 'Invalid record length. Autodetection will be used.'
warnings.warn(msg)
reclen = -1
else:
reclen = int(log(reclen, 2))
# Determine the byteorder.
if header_byteorder == "=":
header_byteorder = NATIVE_BYTEORDER
if header_byteorder is None:
header_byteorder = -1
elif header_byteorder in [0, "0", "<"]:
header_byteorder = 0
elif header_byteorder in [1, "1", ">"]:
header_byteorder = 1
# The quality flag is no more supported. Raise a warning.
if 'quality' in kwargs:
msg = 'The quality flag is no more supported in this version of ' + \
'obspy.mseed. obspy.mseed.util has some functions with similar ' + \
'behaviour.'
warnings.warn(msg, category=DeprecationWarning)
# Parse some information about the file.
if recinfo:
# Pass the byteorder if enforced.
if header_byteorder == 0:
bo = "<"
elif header_byteorder > 0:
bo = ">"
else:
bo = None
info = util.getRecordInformation(mseed_object, endian=bo)
info['encoding'] = ENCODINGS[info['encoding']][0]
# Only keep information relevant for the whole file.
info = {'encoding': info['encoding'],
'filesize': info['filesize'],
'record_length': info['record_length'],
'byteorder': info['byteorder'],
'number_of_records': info['number_of_records']}
# If its a filename just read it.
if isinstance(mseed_object, basestring):
# Read to NumPy array which is used as a buffer.
buffer = np.fromfile(mseed_object, dtype='b')
elif hasattr(mseed_object, 'read'):
buffer = np.fromstring(mseed_object.read(), dtype='b')
# Get the record length
try:
record_length = pow(2, int(''.join([chr(_i) for _i in buffer[19:21]])))
except ValueError:
record_length = 4096
# Search for data records and pass only the data part to the underlying C
# routine.
offset = 0
# 0 to 9 are defined in a row in the ASCII charset.
min_ascii = ord('0')
# Small function to check whether an array of ASCII values contains only
# digits.
isdigit = lambda x: True if (x - min_ascii).max() <= 9 else False
while True:
# This should never happen
if (isdigit(buffer[offset:offset + 6]) is False) or \
(buffer[offset + 6] not in VALID_CONTROL_HEADERS):
msg = 'Not a valid (Mini-)SEED file'
raise Exception(msg)
elif buffer[offset + 6] in SEED_CONTROL_HEADERS:
offset += record_length
continue
break
buffer = buffer[offset:]
buflen = len(buffer)
# If no selection is given pass None to the C function.
if starttime is None and endtime is None and sourcename is None:
selections = None
else:
select_time = SelectTime()
selections = Selections()
selections.timewindows.contents = select_time
if starttime is not None:
if not isinstance(starttime, UTCDateTime):
msg = 'starttime needs to be a UTCDateTime object'
raise ValueError(msg)
selections.timewindows.contents.starttime = \
util._convertDatetimeToMSTime(starttime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.starttime = HPTERROR
if endtime is not None:
if not isinstance(endtime, UTCDateTime):
msg = 'endtime needs to be a UTCDateTime object'
raise ValueError(msg)
selections.timewindows.contents.endtime = \
util._convertDatetimeToMSTime(endtime)
else:
# HPTERROR results in no starttime.
selections.timewindows.contents.endtime = HPTERROR
if sourcename is not None:
if not isinstance(sourcename, basestring):
msg = 'sourcename needs to be a string'
raise ValueError(msg)
# libmseed uses underscores as separators and allows filtering
# after the dataquality which is disabled here to not confuse
# users. (* == all data qualities)
selections.srcname = sourcename.replace('.', '_') + '_*'
else:
selections.srcname = '*'
all_data = []
# Use a callback function to allocate the memory and keep track of the
# data.
def allocate_data(samplecount, sampletype):
# Enhanced sanity checking for libmseed 2.10 can result in the
# sampletype not being set. Just return an empty array in this case.
if sampletype == "\x00":
data = np.empty(0)
else:
data = np.empty(samplecount, dtype=DATATYPES[sampletype])
all_data.append(data)
return data.ctypes.data
# XXX: Do this properly!
# Define Python callback function for use in C function. Return a long so
# it hopefully works on 32 and 64 bit systems.
allocData = C.CFUNCTYPE(C.c_long, C.c_int, C.c_char)(allocate_data)
try:
verbose = int(verbose)
except:
verbose = 0
lil = clibmseed.readMSEEDBuffer(buffer, buflen, selections, unpack_data,
reclen, C.c_int(verbose), C.c_int(details), header_byteorder,
allocData)
# XXX: Check if the freeing works.
del selections
traces = []
try:
currentID = lil.contents
# Return stream if not traces are found.
except ValueError:
clibmseed.lil_free(lil)
del lil
return Stream()
while True:
# Init header with the essential information.
header = {'network': currentID.network.strip(),
'station': currentID.station.strip(),
'location': currentID.location.strip(),
'channel': currentID.channel.strip(),
'mseed': {'dataquality': currentID.dataquality}}
# Loop over segments.
try:
currentSegment = currentID.firstSegment.contents
except ValueError:
break
while True:
header['sampling_rate'] = currentSegment.samprate
header['starttime'] = \
util._convertMSTimeToDatetime(currentSegment.starttime)
# TODO: write support is missing
if details:
timing_quality = currentSegment.timing_quality
if timing_quality == 0xFF: # 0xFF is mask for not known timing
timing_quality = -1
header['mseed']['timing_quality'] = timing_quality
header['mseed']['calibration_type'] = \
currentSegment.calibration_type
if headonly is False:
# The data always will be in sequential order.
data = all_data.pop(0)
header['npts'] = len(data)
else:
data = np.array([])
header['npts'] = currentSegment.samplecnt
# Make sure to init the number of samples.
trace = Trace(header=header, data=data)
# Append information if necessary.
if recinfo:
for key, value in info.iteritems():
setattr(trace.stats.mseed, key, value)
traces.append(trace)
# A Null pointer access results in a ValueError
try:
currentSegment = currentSegment.next.contents
except ValueError:
break
try:
currentID = currentID.next.contents
except ValueError:
break
clibmseed.lil_free(lil)
del lil
return Stream(traces=traces)