122 lines
3.3 KiB
Python
122 lines
3.3 KiB
Python
from __future__ import annotations
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import multiprocessing
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import sys
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from concurrent.futures import ThreadPoolExecutor
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from typing import TYPE_CHECKING
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from gi.repository import GLib, Gst
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if TYPE_CHECKING:
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from .file_model import FileItem
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DEFAULT_SEEK_FLAGS = (
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Gst.SeekFlags.FLUSH
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| Gst.SeekFlags.KEY_UNIT
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| Gst.SeekFlags.SNAP_NEAREST
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| Gst.SeekFlags.TRICKMODE
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| Gst.SeekFlags.TRICKMODE_KEY_UNITS
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| Gst.SeekFlags.TRICKMODE_NO_AUDIO
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)
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__all__ = ["Thumbnailer", "generate_thumbnail_sync"]
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MAX_WORKERS = max(1, multiprocessing.cpu_count() // 2)
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class Thumbnailer(ThreadPoolExecutor):
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def __init__(self):
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super().__init__(
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thread_name_prefix="Thumbnailer",
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max_workers=MAX_WORKERS,
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)
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def generate_thumbnail(self, file_item: FileItem):
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"""Schedule thumbnail generation"""
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if not file_item.full_path.is_file():
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return
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if file_item.attempted_thumbnail:
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return
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if self._work_queue.qsize() >= MAX_WORKERS:
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# print("[thumbnail] Ignoring:", file_item.full_path.name)
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return
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self.submit(generate_thumbnail_sync, file_item)
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file_item.attempted_thumbnail = True
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def generate_thumbnail_sync(file_item: FileItem):
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"""Generate thumbnail for a single file"""
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# print("[thumbnailer] Generate:", file_item.full_path.name)
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pipeline_str = (
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"uridecodebin name=uridecodebin ! "
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"videoconvert ! "
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"jpegenc quality=85 ! "
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"appsink sync=false name=sink"
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)
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pipeline = Gst.parse_launch(pipeline_str)
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assert isinstance(pipeline, Gst.Pipeline)
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sink = pipeline.get_by_name("sink")
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assert isinstance(sink, Gst.Element)
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uridecodebin = pipeline.get_by_name("uridecodebin")
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assert isinstance(uridecodebin, Gst.Element)
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# Set file URI
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uridecodebin.set_property("uri", Gst.filename_to_uri(str(file_item.full_path)))
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try:
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# Set pipeline to PAUSED to get duration
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pipeline.set_state(Gst.State.PAUSED)
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pipeline.get_state(Gst.CLOCK_TIME_NONE)
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# Obtain total duration
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success, duration = pipeline.query_duration(Gst.Format.TIME)
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if not success:
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raise RuntimeError("Failed to query duration")
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# Seek to 1/3 of duration
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seek_pos = duration // 3
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pipeline.seek_simple(Gst.Format.TIME, DEFAULT_SEEK_FLAGS, seek_pos)
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# Start playing to capture frame
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pipeline.set_state(Gst.State.PLAYING)
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sample = sink.emit("pull-sample")
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if not sample:
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raise RuntimeError("Failed to pull sample")
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# Extract image data
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buffer = sample.get_buffer()
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if not buffer:
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raise RuntimeError("Failed to get buffer")
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success, map_info = buffer.map(Gst.MapFlags.READ)
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if not success:
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raise RuntimeError("Failed to map buffer")
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try:
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thumbnail = bytes(map_info.data)
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finally:
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buffer.unmap(map_info)
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def set_thumbnail():
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file_item.thumbnail = thumbnail
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file_item.has_thumbnail = True
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GLib.idle_add(set_thumbnail)
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except Exception as err:
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print("[thumbnailer] Error:", file_item.full_path.name, file=sys.stderr)
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print("[thumbnailer]", err, file=sys.stderr)
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finally:
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pipeline.set_state(Gst.State.NULL)
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