303 lines
9.3 KiB
Python
303 lines
9.3 KiB
Python
"""
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Python wrapper for ffprobe command line tool. ffprobe must exist in the path.
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"""
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import asyncio
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import functools
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import json
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import operator
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import os
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import subprocess # qa: ignore
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from pathlib import Path
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from app.features.streaming.types import FFProbeError
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from app.library.log import get_logger
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from app.library.Utils import timed_lru_cache
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LOG = get_logger()
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class FFStream:
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"""
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An object representation of an individual stream in a multimedia file.
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"""
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def __init__(self, json_data: dict):
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for key, val in json_data.items():
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setattr(self, key, val)
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try:
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self.__dict__["framerate"] = round(
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functools.reduce(operator.truediv, map(int, self.__dict__.get("avg_frame_rate", "").split("/")))
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)
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except ValueError:
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self.__dict__["framerate"] = None
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except ZeroDivisionError:
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self.__dict__["framerate"] = 0
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def __repr__(self):
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if "codec_long_name" not in self.__dict__:
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self.__dict__["codec_long_name"] = self.__dict__.get("codec_name", "")
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index = self.__dict__.get("index", "?")
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codec_type = self.__dict__.get("codec_type", "unknown")
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codec_long_name = self.__dict__.get("codec_long_name", "")
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if self.is_video():
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return f"<Stream: #{index} [{codec_type}] {codec_long_name}, {self.__dict__.get('framerate')}, ({self.__dict__.get('width')}x{self.__dict__.get('height')})>"
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if self.is_audio():
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return (
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f"<Stream: #{index} [{codec_type}] {codec_long_name}, "
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f"channels: {self.__dict__.get('channels')} ({self.__dict__.get('channel_layout')}), "
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f"{self.__dict__.get('sample_rate')}Hz> "
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)
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if self.is_subtitle() or self.is_attachment():
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return f"<Stream: #{index} [{codec_type}] {codec_long_name}>"
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return f"<Stream: #{index} [{codec_type}]>"
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def is_audio(self):
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"""
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Is this stream labelled as an audio stream?
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"""
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return self.__dict__.get("codec_type", None) == "audio"
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def is_video(self):
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"""
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Is the stream labelled as a video stream.
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"""
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if self.__dict__.get("codec_type", None) != "video":
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return False
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return self.__dict__.get("codec_name", None) not in ["png", "mjpeg", "gif", "bmp", "tiff", "webp"]
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def is_subtitle(self):
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"""
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Is the stream labelled as a subtitle stream.
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"""
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return self.__dict__.get("codec_type", None) == "subtitle"
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def is_attachment(self):
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"""
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Is the stream labelled as a attachment stream.
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"""
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return self.__dict__.get("codec_type", None) == "attachment"
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def frame_size(self):
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"""
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Returns the pixel frame size as an integer tuple (width,height) if the stream is a video stream.
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Returns None if it is not a video stream.
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"""
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size = None
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if self.is_video():
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width = self.__dict__["width"]
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height = self.__dict__["height"]
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if width and height:
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try:
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size = (int(width), int(height))
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except ValueError as e:
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msg = f"None integer size {width}:{height}"
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raise FFProbeError(msg) from e
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else:
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return None
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return size
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def pixel_format(self):
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"""
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Returns a string representing the pixel format of the video stream. e.g. yuv420p.
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Returns none is it is not a video stream.
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"""
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return self.__dict__.get("pix_fmt", None)
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def frames(self):
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"""
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Returns the length of a video stream in frames. Returns 0 if not a video stream.
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"""
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if self.is_video() or self.is_audio():
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try:
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frame_count = int(self.__dict__.get("nb_frames", ""))
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except ValueError as e:
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msg = "None integer frame count"
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raise FFProbeError(msg) from e
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else:
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frame_count = 0
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return frame_count
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def duration_seconds(self):
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"""
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Returns the runtime duration of the video stream as a floating point number of seconds.
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Returns 0.0 if not a video stream.
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"""
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if self.is_video() or self.is_audio():
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try:
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duration = float(self.__dict__.get("duration", ""))
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except ValueError as e:
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msg = "None numeric duration"
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raise FFProbeError(msg) from e
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else:
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duration = 0.0
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return duration
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def language(self):
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"""
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Returns language tag of stream. e.g. eng
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"""
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return self.__dict__.get("TAG:language", None)
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def codec(self):
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"""
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Returns a string representation of the stream codec.
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"""
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return self.__dict__.get("codec_name", None)
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def codec_description(self):
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"""
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Returns a long representation of the stream codec.
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"""
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return self.__dict__.get("codec_long_name", None)
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def codec_tag(self):
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"""
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Returns a short representative tag of the stream codec.
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"""
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return self.__dict__.get("codec_tag_string", None)
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def bit_rate(self):
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"""
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Returns bit_rate as an integer in bps
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"""
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try:
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return int(self.__dict__.get("bit_rate", ""))
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except ValueError as e:
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msg = "None integer bit_rate"
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raise FFProbeError(msg) from e
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class FFProbeResult:
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def __init__(self):
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self.metadata: dict = {}
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self.video: list[FFStream] = []
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self.audio: list[FFStream] = []
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self.subtitle: list[FFStream] = []
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self.attachment: list[FFStream] = []
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@property
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def is_video(self):
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return self.has_video()
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@property
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def is_audio(self):
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return self.has_audio()
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def get(self, key: str, default=None):
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return getattr(self, key) if hasattr(self, key) else default
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def streams(self) -> list[FFStream]:
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"""List of all streams."""
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return self.video + self.audio + self.subtitle + self.attachment
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def has_video(self):
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"""Is there a video stream?"""
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return len(self.video) > 0
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def has_audio(self):
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"""Is there an audio stream?"""
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return len(self.audio) > 0
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def has_subtitle(self):
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"""Is there a subtitle stream?"""
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return len(self.subtitle) > 0
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def __repr__(self):
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return "<FFprobe: {metadata}, {video}, {audio}, {subtitle}, {attachment}>".format(**vars(self))
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def deserialize(self, data: dict):
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self.metadata = data.get("metadata", {})
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self.video = [FFStream(v) for v in data.get("video", [])]
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self.audio = [FFStream(a) for a in data.get("audio", [])]
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self.subtitle = [FFStream(s) for s in data.get("subtitle", [])]
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self.attachment = [FFStream(a) for a in data.get("attachment", [])]
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def serialize(self) -> dict:
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return {
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"metadata": self.metadata,
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"video": [v.__dict__ for v in self.video],
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"audio": [a.__dict__ for a in self.audio],
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"subtitle": [s.__dict__ for s in self.subtitle],
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"attachment": [a.__dict__ for a in self.attachment],
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"is_video": self.has_video(),
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"is_audio": self.has_audio(),
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}
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@timed_lru_cache(ttl_seconds=300, max_size=128)
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async def ffprobe(file: Path | str) -> FFProbeResult:
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"""
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Run ffprobe on a file and return the parsed data as a dictionary.
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Args:
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file (str): The path to the media file.
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Returns:
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dict: A dictionary containing the parsed data.
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"""
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f = Path(file) if isinstance(file, str) else file
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if not f.exists():
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msg = f"No such media file '{file}'."
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raise OSError(msg)
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try:
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proc = await asyncio.create_subprocess_exec(
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"ffprobe",
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"-h",
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stdout=asyncio.subprocess.DEVNULL,
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stderr=asyncio.subprocess.DEVNULL,
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creationflags=subprocess.CREATE_NO_WINDOW if os.name == "nt" else 0,
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)
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await proc.wait()
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except FileNotFoundError as e:
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msg = "ffprobe not found."
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raise OSError(msg) from e
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args: list[str] = ["-v", "quiet", "-of", "json", "-show_streams", "-show_format", str(f)]
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p = await asyncio.create_subprocess_exec(
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"ffprobe",
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*args,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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creationflags=subprocess.CREATE_NO_WINDOW if os.name == "nt" else 0,
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)
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exitCode: int = await p.wait()
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data, err = await p.communicate()
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if 0 == exitCode:
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parsed: dict = json.loads(data.decode("utf-8"))
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else:
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msg: str = f"ffprobe returned with non-0 exit code. '{err.decode('utf-8')}'"
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raise FFProbeError(msg)
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result = FFProbeResult()
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result.metadata = parsed.get("format", {})
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for raw_stream in parsed.get("streams", []):
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stream = FFStream(raw_stream)
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if stream.is_audio():
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result.audio.append(stream)
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elif stream.is_video():
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result.video.append(stream)
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elif stream.is_subtitle():
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result.subtitle.append(stream)
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elif stream.is_attachment():
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result.attachment.append(stream)
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return result
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