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perf(dash): collapse single-file tracks that have a sidx gap

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This commit is contained in:
imSp4rky
2026-10-25 13:23:53 -06:00
parent 43fcb030f8
commit 0c58575a5b
4 changed files with 152 additions and 83 deletions
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tests/core/test_dash_collapse.py
+10 -11
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@@ -4,15 +4,13 @@ resource instead of per-segment files + merge."""
from __future__ import annotations
from typing import Optional
from unshackle.core.manifests import DASH
URL = "https://cdn/media.mp4"
def collapsible(segments, init_len: Optional[int], is_subtitle: bool = False) -> bool:
return DASH.collapsible_single_url(is_subtitle, segments, init_len)
def collapsible(segments, init_len: int, is_subtitle: bool = False) -> bool:
return DASH.collapsible_single_url(is_subtitle, segments, init_len) is not None
def test_segmentbase_single_range_eligible():
@@ -29,10 +27,6 @@ def test_subtitle_never_eligible():
assert collapsible([(URL, "863-999999")], init_len=863, is_subtitle=True) is False
def test_missing_init_len_ineligible():
assert collapsible([(URL, "863-999999")], init_len=None) is False
def test_missing_range_ineligible():
assert collapsible([(URL, None)], init_len=863) is False
assert collapsible([(URL, "863-1999"), (URL, None)], init_len=863) is False
@@ -43,9 +37,14 @@ def test_mixed_urls_ineligible():
assert collapsible(segments, init_len=863) is False
def test_first_segment_gap_after_init_ineligible():
# first media byte does not immediately follow the init prefix
assert collapsible([(URL, "900-1999")], init_len=863) is False
def test_first_segment_gap_after_init_left_to_prefix_check():
# the gap may be the sidx; single_url_prefix_matches decides from the bytes
segments = [(URL, "900-1999"), (URL, "2000-2999")]
assert DASH.collapsible_single_url(False, segments, 863) == (900, 2999)
def test_first_segment_inside_init_ineligible():
assert collapsible([(URL, "800-1999")], init_len=863) is False
def test_gap_between_segments_ineligible():