273 lines
8 KiB
Python
273 lines
8 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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from functools import lru_cache
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from typing import TypedDict
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# parameter-less decorator
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def async_lru_cache_decorator(async_function):
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@functools.lru_cache
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def cached_async_function(*args, **kwargs):
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coroutine = async_function(*args, **kwargs)
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return asyncio.ensure_future(coroutine)
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return cached_async_function
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# decorator with options
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def async_lru_cache(*lru_cache_args, **lru_cache_kwargs):
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def async_lru_cache_decorator(async_function):
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@functools.lru_cache(*lru_cache_args, **lru_cache_kwargs)
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def cached_async_function(*args, **kwargs):
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coroutine = async_function(*args, **kwargs)
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return asyncio.ensure_future(coroutine)
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return cached_async_function
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return async_lru_cache_decorator
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class FFProbeError(Exception):
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pass
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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.codec_long_name = self.__dict__.get("codec_name", "")
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if self.is_video():
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return f"<Stream: #{self.index} [{self.codec_type}] {self.codec_long_name}, {self.framerate}, ({self.width}x{self.height})>"
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if self.is_audio():
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return (
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f"<Stream: #{self.index} [{self.codec_type}] {self.codec_long_name}, channels: {self.channels} ({self.channel_layout}), "
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"{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: #{self.index} [{self.codec_type}] {self.codec_long_name}>"
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return f"<Stream: #{self.index} [{self.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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return self.__dict__.get("codec_type", None) == "video"
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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:
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raise FFProbeError("None integer size {}:{}".format(width, height))
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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:
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raise FFProbeError("None integer frame count")
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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:
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raise FFProbeError("None numeric duration")
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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:
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raise FFProbeError("None integer bit_rate")
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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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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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@async_lru_cache(maxsize=512)
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async def ffprobe(file: 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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try:
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with open(os.devnull, "w") as tempf:
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await asyncio.create_subprocess_exec("ffprobe", "-h", stdout=tempf, stderr=tempf)
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except FileNotFoundError:
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raise IOError("ffprobe not found.")
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if not os.path.isfile(file):
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raise IOError(f"No such media file '{file}'.")
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args = ["-v", "quiet", "-of", "json", "-show_streams", "-show_format", file]
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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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)
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exitCode = 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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raise FFProbeError(f"FFProbe return with non-0 exit code. '{err.decode('utf-8')}'")
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result = FFProbeResult()
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result.metadata = parsed.get("format", {})
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for stream in parsed.get("streams", []):
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stream = FFStream(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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