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Source code for galaxy.datatypes.media
"""Video classes"""
import json
import subprocess
import wave
from galaxy.datatypes.binary import Binary
from galaxy.datatypes.metadata import ListParameter, MetadataElement
from galaxy.util import which
[docs]def ffprobe(path):
data = json.loads(subprocess.check_output(['ffprobe', '-loglevel', 'quiet', '-show_format', '-show_streams', '-of', 'json', path]).decode("utf-8"))
return data['format'], data['streams']
[docs]class Audio(Binary):
MetadataElement(name="duration", default=0, desc="Length of audio sample", readonly=True, visible=True, optional=True, no_value=0)
MetadataElement(name="audio_codecs", default=[], desc="Audio codec(s)", param=ListParameter, readonly=True, visible=True, optional=True, no_value=[])
MetadataElement(name="sample_rates", default=[], desc="Sampling Rate(s)", param=ListParameter, readonly=True, visible=True, optional=True, no_value=[])
MetadataElement(name="audio_streams", default=0, desc="Number of audio streams", readonly=True, visible=True, optional=True, no_value=0)
[docs] def set_meta(self, dataset, **kwd):
if which('ffprobe'):
metadata, streams = ffprobe(dataset.file_name)
dataset.metadata.duration = metadata['duration']
dataset.metadata.audio_codecs = [stream['codec_name'] for stream in streams if stream['codec_type'] == 'audio']
dataset.metadata.sample_rates = [stream['sample_rate'] for stream in streams if stream['codec_type'] == 'audio']
dataset.metadata.audio_streams = len([stream for stream in streams if stream['codec_type'] == 'audio'])
[docs]class Video(Binary):
MetadataElement(name="resolution_w", default=0, desc="Width of video stream", readonly=True, visible=True, optional=True, no_value=0)
MetadataElement(name="resolution_h", default=0, desc="Height of video stream", readonly=True, visible=True, optional=True, no_value=0)
MetadataElement(name="fps", default=0, desc="FPS of video stream", readonly=True, visible=True, optional=True, no_value=0)
MetadataElement(name="video_codecs", default=[], desc="Video codec(s)", param=ListParameter, readonly=True, visible=True, optional=True, no_value=[])
MetadataElement(name="audio_codecs", default=[], desc="Audio codec(s)", param=ListParameter, readonly=True, visible=True, optional=True, no_value=[])
MetadataElement(name="video_streams", default=0, desc="Number of video streams", readonly=True, visible=True, optional=True, no_value=0)
MetadataElement(name="audio_streams", default=0, desc="Number of audio streams", readonly=True, visible=True, optional=True, no_value=0)
def _get_resolution(self, streams):
for stream in streams:
if stream['codec_type'] == 'video':
w = stream['width']
h = stream['height']
dividend, divisor = stream['avg_frame_rate'].split('/')
fps = float(dividend) / float(divisor)
else:
w = h = fps = 0
return w, h, fps
[docs] def set_meta(self, dataset, **kwd):
if which('ffprobe'):
metadata, streams = ffprobe(dataset.file_name)
(w, h, fps) = self._get_resolution(streams)
dataset.metadata.resolution_w = w
dataset.metadata.resolution_h = h
dataset.metadata.fps = fps
dataset.metadata.audio_codecs = [stream['codec_name'] for stream in streams if stream['codec_type'] == 'audio']
dataset.metadata.video_codecs = [stream['codec_name'] for stream in streams if stream['codec_type'] == 'video']
dataset.metadata.audio_streams = len([stream for stream in streams if stream['codec_type'] == 'audio'])
dataset.metadata.video_streams = len([stream for stream in streams if stream['codec_type'] == 'video'])
[docs]class Mkv(Video):
file_ext = "mkv"
[docs] def sniff(self, filename):
if which('ffprobe'):
metadata, streams = ffprobe(filename)
return 'matroska' in metadata['format_name'].split(',')
[docs]class Mp4(Video):
"""
Class that reads MP4 video file.
>>> from galaxy.datatypes.sniff import sniff_with_cls
>>> sniff_with_cls(Mp4, 'video_1.mp4')
True
>>> sniff_with_cls(Mp4, 'audio_1.mp4')
False
"""
file_ext = "mp4"
[docs] def sniff(self, filename):
if which('ffprobe'):
metadata, streams = ffprobe(filename)
return 'mp4' in metadata['format_name'].split(',')
[docs]class Flv(Video):
file_ext = "flv"
[docs] def sniff(self, filename):
if which('ffprobe'):
metadata, streams = ffprobe(filename)
return 'flv' in metadata['format_name'].split(',')
[docs]class Mpg(Video):
file_ext = "mpg"
[docs] def sniff(self, filename):
if which('ffprobe'):
metadata, streams = ffprobe(filename)
return 'mpegvideo' in metadata['format_name'].split(',')
[docs]class Mp3(Audio):
"""
Class that reads MP3 audio file.
>>> from galaxy.datatypes.sniff import sniff_with_cls
>>> sniff_with_cls(Mp3, 'audio_2.mp3')
True
>>> sniff_with_cls(Mp3, 'audio_1.wav')
False
"""
file_ext = "mp3"
[docs] def sniff(self, filename):
if which('ffprobe'):
metadata, streams = ffprobe(filename)
return 'mp3' in metadata['format_name'].split(',')
[docs]class Wav(Audio):
"""Class that reads WAV audio file
>>> from galaxy.datatypes.sniff import sniff_with_cls
>>> sniff_with_cls(Wav, 'hello.wav')
True
>>> sniff_with_cls(Wav, 'audio_2.mp3')
False
>>> sniff_with_cls(Wav, 'drugbank_drugs.cml')
False
"""
file_ext = "wav"
blurb = "RIFF WAV Audio file"
is_binary = True
MetadataElement(name="rate", desc="Sample Rate", default=0, no_value=0, readonly=True, visible=True, optional=True)
MetadataElement(name="nframes", desc="Number of Samples", default=0, no_value=0, readonly=True, visible=True, optional=True)
MetadataElement(name="nchannels", desc="Number of Channels", default=0, no_value=0, readonly=True, visible=True, optional=True)
MetadataElement(name="sampwidth", desc="Sample Width", default=0, no_value=0, readonly=True, visible=True, optional=True)
[docs] def set_meta(self, dataset, overwrite=True, **kwd):
"""Set the metadata for this dataset from the file contents."""
try:
with wave.open(dataset.dataset.file_name, 'rb') as fd:
dataset.metadata.rate = fd.getframerate()
dataset.metadata.nframes = fd.getnframes()
dataset.metadata.sampwidth = fd.getsampwidth()
dataset.metadata.nchannels = fd.getnchannels()
except wave.Error:
pass