gwframe

High-level Python library to work with gravitational-wave frame (GWF) files, based on framecpp

Resources¶

Installation¶

With pip:

pip install gwframe

With conda:

conda install -c conda-forge gwframe

Features¶

Multi-frame writing - Write multiple frames to a single file
Multi-channel support - Read all channels or specific lists with a single call
Self-contained wheels - No external dependencies required for pip installation

Quickstart¶

Reading frames¶

import gwframe

# Read single channel
data = gwframe.read('data.gwf', 'L1:GWOSC-16KHZ_R1_STRAIN')
print(f"Read {len(data.array)} samples at {data.sample_rate} Hz")
print(f"Time range: {data.t0} to {data.t0 + data.duration}")

# Read all channels
channels = gwframe.read('data.gwf', channel=None)
for name, timeseries in channels.items():
    print(f"{name}: {len(timeseries.array)} samples")

# Time-based slicing (automatically stitches multiple frames)
data = gwframe.read('multi_frame.gwf', 'L1:STRAIN',
                    start=1234567890.0, end=1234567900.0)

Writing single frames¶

import gwframe
import numpy as np

data = np.random.randn(16384)
gwframe.write('output.gwf', data, t0=1234567890.0,
              sample_rate=16384, name='L1:TEST')

Writing multiple frames¶

import gwframe
import numpy as np

# Write multiple frames to a single file
with gwframe.FrameWriter('multi_frame.gwf') as writer:
    for i in range(20):
        data = np.random.randn(16384)
        writer.write(data, t0=1234567890.0 + i,
                     sample_rate=16384, name='L1:TEST')

Inspecting frames¶

import gwframe

# Get frame information
info = gwframe.get_info('data.gwf')
print(f"Number of frames: {info.num_frames}")
for frame in info.frames:
    print(f"Frame {frame.index}: {frame.name} at GPS {frame.t0}, duration {frame.duration}s")

# List all channels
channels = gwframe.get_channels('data.gwf')
num_channels = len(channels)
for channel in channels:
    print(channel)

Advanced: Full control with Frame objects¶

import gwframe
import numpy as np

# Create frame with multiple channels and metadata
frame = gwframe.Frame(
    t0=1234567890.0,
    duration=1.0,
    name='L1',
    run=1
)

# Add channels
strain = np.random.randn(16384)
frame.add_channel('L1:STRAIN', strain,
                  sample_rate=16384,
                  unit='strain',
                  channel_type='proc')

aux = np.random.randn(1024).astype(np.float32)
frame.add_channel('L1:AUX', aux,
                  sample_rate=1024,
                  unit='counts',
                  channel_type='adc')

# Add metadata
frame.add_history('gwframe', 'Created with gwframe')

# Write with custom compression
frame.write('output.gwf', compression=gwframe.Compression.GZIP)

CLI Tools¶

gwframe includes a command-line interface for common frame manipulation tasks:

# Rename channels
gwframe rename input.gwf -o output.gwf -m "L1:OLD=>L1:NEW"

# Combine channels from multiple files
gwframe combine file1.gwf file2.gwf -o output/

# Remove unwanted channels
gwframe drop input.gwf -o output.gwf -c L1:UNWANTED

# Change frame duration
gwframe resize input.gwf -o output/ -d 4.0

# Replace NaN or sentinel values
gwframe impute input.gwf -o output.gwf --fill-value 0.0

# Update channel data from another file
gwframe replace base.gwf --update new.gwf -o output/ -c L1:STRAIN

# Change compression settings
gwframe recompress input.gwf -o output.gwf -c GZIP -l 9

All commands support batch processing with directories and glob patterns. See the CLI documentation for detailed usage and examples.