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# -*- coding: utf-8 -*-
from __future__ import annotations
from datetime import timedelta
import logging
from babelfish import Language
from .disposition import FFprobeSubtitleDisposition
from .exceptions import UnsupportedCodec
from .tags import FFprobeGenericSubtitleTags
logger = logging.getLogger(__name__)
class FFprobeSubtitleStream:
"""Base class for FFprobe (FFmpeg) extractable subtitle streams."""
def __init__(self, stream: dict):
"""
:raises: LanguageNotFound, UnsupportedCodec
"""
self.index = int(stream["index"])
self.codec_name = stream.get("codec_name", "Unknown")
try:
self._codec = _codecs[self.codec_name]
except KeyError:
raise UnsupportedCodec(f"{self.codec_name} is not supported")
self.r_frame_rate = stream.get("r_frame_rate")
self.avg_frame_rate = stream.get("avg_frame_rate")
self.start_time = timedelta(seconds=float(stream.get("start_time", 0)))
self.start_pts = timedelta(milliseconds=int(stream.get("start_pts", 0)))
self.duration_ts = timedelta(milliseconds=int(stream.get("duration_ts", 0)))
self.duration = timedelta(seconds=float(stream.get("duration", 0)))
self.tags = FFprobeGenericSubtitleTags.detect_cls_from_data(
stream.get("tags", {})
)
self.disposition = FFprobeSubtitleDisposition(stream.get("disposition", {}))
self.disposition.update_from_tags(stream.get("tags", {}) or {})
def convert_args(self, convert_format, outfile):
"""
convert_format: Union[str, None] = the codec format to convert. if None is set, defaults
to 'convert_default_format' codec's key
outfile: str = output file
raises UnsupportedCodec if convert_format doesn't exist or if the codec doesn't
support conversion
"""
convert_format = convert_format or self._codec["convert_default_format"]
if convert_format is None or not any(
convert_format == item["copy_format"] for item in _codecs.values()
):
raise UnsupportedCodec(f"Unknown convert format: {convert_format}")
if not self._codec["convert"]:
raise UnsupportedCodec(
f"{self.codec_name} codec doesn't support conversion"
)
return ["-map", f"0:{self.index}", "-f", convert_format, outfile]
def copy_args(self, outfile):
"raises UnsupportedCodec if the codec doesn't support copy"
if not self._codec["copy"] or not self._codec["copy_format"]:
raise UnsupportedCodec(f"{self.codec_name} doesn't support copy")
return [
"-map",
f"0:{self.index}",
"-c:s",
"copy",
"-f",
self._codec["copy_format"],
outfile,
]
@property
def language(self):
# Legacy
return self.tags.language
@language.setter
def language(self, value: Language):
self.tags.language = value
@property
def extension(self):
return self._codec["copy_format"] or self._codec["convert_default_format"] or ""
@property
def convert_default_format(self):
return self._codec["convert_default_format"]
@property
def type(self):
return self._codec["type"]
@property
def suffix(self):
return ".".join(
item
for item in (self.tags.suffix, self.disposition.suffix, self.extension)
if item
)
def __repr__(self) -> str:
return f"<{self.codec_name.upper()}: {self.tags}@{self.disposition}>"
_codecs = {
"ass": {
"type": "text",
"copy": True,
"copy_format": "ass",
"convert": True,
"convert_default_format": "srt",
},
"subrip": {
"type": "text",
"copy": True,
"copy_format": "srt",
"convert": True,
"convert_default_format": "srt",
},
"webvtt": {
"type": "text",
"copy": True,
"copy_format": "webvtt",
"convert": True,
"convert_default_format": "srt",
},
"mov_text": {
"type": "text",
"copy": False,
"copy_format": None,
"convert": True,
"convert_default_format": "srt",
},
"hdmv_pgs_subtitle": {
"type": "bitmap",
"copy": True,
"copy_format": "sup",
"convert": False,
"convert_default_format": None,
},
"dvb_subtitle": {
"type": "bitmap",
"copy": True,
"copy_format": "sup",
"convert": False,
"convert_default_format": None,
},
"dvd_subtitle": {
"type": "bitmap",
"copy": True,
"copy_format": "sup",
"convert": False,
"convert_default_format": None,
},
}
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