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from __future__ import annotations
from dataclasses import dataclass
from fractions import Fraction
from pathlib import Path
import av
from log import Log
@dataclass(slots=True, frozen=True)
class VideoStream:
width: int
height: int
codec: str
fps: Fraction
duration: float
sar: Fraction
time_base: Fraction | None
pix_fmt: str | None
color_range: int
color_space: int
color_primaries: int
color_transfer: int
bitrate: int
lang: str | None
@dataclass(slots=True, frozen=True)
class AudioStream:
codec: str
samplerate: int
layout: str
channels: int
duration: float
bitrate: int
lang: str | None
@dataclass(slots=True, frozen=True)
class SubtitleStream:
codec: str
ext: str
lang: str | None
@dataclass(slots=True, frozen=True)
class FileInfo:
path: Path
bitrate: int
duration: float
videos: tuple[VideoStream, ...]
audios: tuple[AudioStream, ...]
subtitles: tuple[SubtitleStream, ...]
@classmethod
def init(self, path: str, log: Log) -> FileInfo:
try:
cont = av.open(path, "r")
except av.error.FileNotFoundError:
log.error(f"Input file doesn't exist: {path}")
except av.error.IsADirectoryError:
log.error(f"Expected a media file, but got a directory: {path}")
except av.error.InvalidDataError:
log.error(f"Invalid data when processing: {path}")
videos: tuple[VideoStream, ...] = ()
audios: tuple[AudioStream, ...] = ()
subtitles: tuple[SubtitleStream, ...] = ()
for v in cont.streams.video:
if v.duration is not None and v.time_base is not None:
vdur = float(v.duration * v.time_base)
else:
vdur = 0.0
fps = v.average_rate
if (fps is None or fps < 1) and v.name in {"png", "mjpeg", "webp"}:
fps = Fraction(25)
if fps is None or fps == 0:
fps = Fraction(30)
if v.sample_aspect_ratio is None:
sar = Fraction(1)
else:
sar = v.sample_aspect_ratio
cc = v.codec_context
if v.name is None:
log.error(f"Can't detect codec for video stream {v}")
videos += (
VideoStream(
v.width,
v.height,
v.codec.canonical_name,
fps,
vdur,
sar,
v.time_base,
getattr(v.format, "name", None),
cc.color_range,
cc.colorspace,
cc.color_primaries,
cc.color_trc,
0 if v.bit_rate is None else v.bit_rate,
v.language,
),
)
for a in cont.streams.audio:
adur = 0.0
if a.duration is not None and a.time_base is not None:
adur = float(a.duration * a.time_base)
a_cc = a.codec_context
audios += (
AudioStream(
a_cc.codec.canonical_name,
0 if a_cc.sample_rate is None else a_cc.sample_rate,
a.layout.name,
a_cc.channels,
adur,
0 if a_cc.bit_rate is None else a_cc.bit_rate,
a.language,
),
)
for s in cont.streams.subtitles:
codec = s.codec_context.name
sub_exts = {"mov_text": "srt", "ass": "ass", "webvtt": "vtt"}
ext = sub_exts.get(codec, "vtt")
subtitles += (SubtitleStream(codec, ext, s.language),)
bitrate = 0 if cont.bit_rate is None else cont.bit_rate
dur = 0 if cont.duration is None else cont.duration / av.time_base
cont.close()
return FileInfo(Path(path), bitrate, dur, videos, audios, subtitles)
def __repr__(self) -> str:
return f"@{self.path.name}"
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