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from __future__ import annotations
import pytest
import av
from av import Packet
from av.bitstream import BitStreamFilterContext, bitstream_filters_available
from .common import TestCase, fate_suite
def is_annexb(packet: Packet | bytes | None) -> bool:
if packet is None:
return False
data = bytes(packet)
return data[:3] == b"\0\0\x01" or data[:4] == b"\0\0\0\x01"
def test_filters_availible() -> None:
assert "h264_mp4toannexb" in bitstream_filters_available
def test_filter_chomp() -> None:
ctx = BitStreamFilterContext("chomp")
src_packets: tuple[Packet, None] = (Packet(b"\x0012345\0\0\0"), None)
assert bytes(src_packets[0]) == b"\x0012345\0\0\0"
result_packets = []
for p in src_packets:
result_packets.extend(ctx.filter(p))
assert len(result_packets) == 1
assert bytes(result_packets[0]) == b"\x0012345"
def test_filter_setts() -> None:
ctx = BitStreamFilterContext("setts=pts=N")
ctx2 = BitStreamFilterContext(b"setts=pts=N")
del ctx2
p1 = Packet(b"\0")
p1.pts = 42
p2 = Packet(b"\0")
p2.pts = 50
src_packets = [p1, p2, None]
result_packets: list[Packet] = []
for p in src_packets:
result_packets.extend(ctx.filter(p))
assert len(result_packets) == 2
assert result_packets[0].pts == 0
assert result_packets[1].pts == 1
def test_filter_h264_mp4toannexb() -> None:
with av.open(fate_suite("h264/interlaced_crop.mp4"), "r") as container:
stream = container.streams.video[0]
ctx = BitStreamFilterContext("h264_mp4toannexb", stream)
res_packets = []
for p in container.demux(stream):
assert not is_annexb(p)
res_packets.extend(ctx.filter(p))
assert len(res_packets) == stream.frames
for p in res_packets:
assert is_annexb(p)
def test_filter_output_parameters() -> None:
with av.open(fate_suite("h264/interlaced_crop.mp4"), "r") as container:
stream = container.streams.video[0]
assert not is_annexb(stream.codec_context.extradata)
ctx = BitStreamFilterContext("h264_mp4toannexb", stream)
assert not is_annexb(stream.codec_context.extradata)
del ctx
_ = BitStreamFilterContext("h264_mp4toannexb", stream, out_stream=stream)
assert is_annexb(stream.codec_context.extradata)
def test_filter_flush() -> None:
with av.open(fate_suite("h264/interlaced_crop.mp4"), "r") as container:
stream = container.streams.video[0]
ctx = BitStreamFilterContext("h264_mp4toannexb", stream)
res_packets = []
for p in container.demux(stream):
res_packets.extend(ctx.filter(p))
assert len(res_packets) == stream.frames
container.seek(0)
# Without flushing, we expect to get an error: "A non-NULL packet sent after an EOF."
with pytest.raises(ValueError):
for p in container.demux(stream):
ctx.filter(p)
ctx.flush()
container.seek(0)
for p in container.demux(stream):
res_packets.extend(ctx.filter(p))
assert len(res_packets) == stream.frames * 2
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