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import errno
from fractions import Fraction
import numpy as np
import av
from av import AudioFrame, VideoFrame
from av.audio.frame import format_dtypes
from av.filter import Filter, Graph
from .common import TestCase, has_pillow
def generate_audio_frame(
frame_num: int,
input_format: str = "s16",
layout: str = "stereo",
sample_rate: int = 44100,
frame_size: int = 1024,
) -> AudioFrame:
"""
Generate audio frame representing part of the sinusoidal wave
"""
frame = AudioFrame(format=input_format, layout=layout, samples=frame_size)
frame.sample_rate = sample_rate
frame.pts = frame_num * frame_size
for i in range(frame.layout.nb_channels):
data = np.zeros(frame_size, dtype=format_dtypes[input_format])
for j in range(frame_size):
data[j] = np.sin(2 * np.pi * (frame_num + j) * (i + 1) / float(frame_size))
frame.planes[i].update(data) # type: ignore
return frame
def pull_until_blocked(graph: Graph) -> list[av.VideoFrame]:
frames: list[av.VideoFrame] = []
while True:
try:
frames.append(graph.vpull())
except av.FFmpegError as e:
if e.errno != errno.EAGAIN:
raise
return frames
class TestFilters(TestCase):
def test_filter_descriptor(self) -> None:
f = Filter("testsrc")
assert f.name == "testsrc"
assert f.description == "Generate test pattern."
assert not f.dynamic_inputs
assert len(f.inputs) == 0
assert not f.dynamic_outputs
assert len(f.outputs) == 1
assert f.outputs[0].name == "default"
assert f.outputs[0].type == "video"
def test_dynamic_filter_descriptor(self):
f = Filter("split")
assert not f.dynamic_inputs
assert len(f.inputs) == 1
assert f.dynamic_outputs
assert len(f.outputs) == 0
def test_generator_graph(self):
graph = Graph()
src = graph.add("testsrc")
lutrgb = graph.add(
"lutrgb",
"r=maxval+minval-val:g=maxval+minval-val:b=maxval+minval-val",
name="invert",
)
sink = graph.add("buffersink")
src.link_to(lutrgb)
lutrgb.link_to(sink)
# pads and links
assert src.outputs[0].link.output is lutrgb.inputs[0]
assert lutrgb.inputs[0].link.input is src.outputs[0]
frame = sink.pull()
assert isinstance(frame, VideoFrame)
if has_pillow:
frame.to_image().save(self.sandboxed("mandelbrot2.png"))
def test_auto_find_sink(self) -> None:
graph = Graph()
src = graph.add("testsrc")
src.link_to(graph.add("buffersink"))
graph.configure()
frame = graph.vpull()
if has_pillow:
frame.to_image().save(self.sandboxed("mandelbrot3.png"))
def test_delegate_sink(self) -> None:
graph = Graph()
src = graph.add("testsrc")
src.link_to(graph.add("buffersink"))
graph.configure()
frame = src.pull()
assert isinstance(frame, av.VideoFrame)
if has_pillow:
frame.to_image().save(self.sandboxed("mandelbrot4.png"))
def test_audio_buffer_sink(self):
graph = Graph()
audio_buffer = graph.add_abuffer(
format="fltp",
sample_rate=48000,
layout="stereo",
time_base=Fraction(1, 48000),
)
audio_buffer.link_to(graph.add("abuffersink"))
graph.configure()
try:
graph.pull()
except OSError as e:
# we haven't pushed any input so expect no frames / EAGAIN
if e.errno != errno.EAGAIN:
raise
def test_audio_buffer_resample(self) -> None:
graph = Graph()
graph.link_nodes(
graph.add_abuffer(
format="fltp",
sample_rate=48000,
layout="stereo",
time_base=Fraction(1, 48000),
),
graph.add(
"aformat", "sample_fmts=s16:sample_rates=44100:channel_layouts=stereo"
),
graph.add("abuffersink"),
).configure()
graph.push(
generate_audio_frame(
0, input_format="fltp", layout="stereo", sample_rate=48000
)
)
out_frame = graph.pull()
assert isinstance(out_frame, av.AudioFrame)
assert out_frame.format.name == "s16"
assert out_frame.layout.name == "stereo"
assert out_frame.sample_rate == 44100
def test_audio_buffer_frame_size(self):
graph = Graph()
graph.link_nodes(
graph.add_abuffer(
format="fltp",
sample_rate=48000,
layout="stereo",
time_base=Fraction(1, 48000),
),
graph.add("abuffersink"),
).configure()
graph.set_audio_frame_size(256)
graph.push(
generate_audio_frame(
0,
input_format="fltp",
layout="stereo",
sample_rate=48000,
frame_size=1024,
)
)
out_frame = graph.pull()
assert out_frame.sample_rate == 48000
assert out_frame.samples == 256
def test_audio_buffer_volume_filter(self):
graph = Graph()
graph.link_nodes(
graph.add_abuffer(
format="fltp",
sample_rate=48000,
layout="stereo",
time_base=Fraction(1, 48000),
),
graph.add("volume", volume="0.5"),
graph.add("abuffersink"),
).configure()
input_frame = generate_audio_frame(
0, input_format="fltp", layout="stereo", sample_rate=48000
)
graph.push(input_frame)
out_frame = graph.pull()
assert out_frame.format.name == "fltp"
assert out_frame.layout.name == "stereo"
assert out_frame.sample_rate == 48000
input_data = input_frame.to_ndarray()
output_data = out_frame.to_ndarray()
assert np.allclose(input_data * 0.5, output_data)
def test_video_buffer(self):
input_container = av.open(format="lavfi", file="color=c=pink:duration=1:r=30")
input_video_stream = input_container.streams.video[0]
graph = av.filter.Graph()
buffer = graph.add_buffer(template=input_video_stream)
bwdif = graph.add("bwdif", "send_field:tff:all")
buffersink = graph.add("buffersink")
buffer.link_to(bwdif)
bwdif.link_to(buffersink)
graph.configure()
for frame in input_container.decode():
assert frame.time_base == Fraction(1, 30)
graph.vpush(frame)
filtered_frames = pull_until_blocked(graph)
if frame.pts == 0:
# no output for the first input frame
assert len(filtered_frames) == 0
else:
# we expect two filtered frames per input frame
assert len(filtered_frames) == 2
assert filtered_frames[0].pts == (frame.pts - 1) * 2
assert filtered_frames[0].time_base == Fraction(1, 60)
assert filtered_frames[1].pts == (frame.pts - 1) * 2 + 1
assert filtered_frames[1].time_base == Fraction(1, 60)
def test_EOF(self) -> None:
input_container = av.open(format="lavfi", file="color=c=pink:duration=1:r=30")
video_stream = input_container.streams.video[0]
graph = av.filter.Graph()
video_in = graph.add_buffer(template=video_stream)
palette_gen_filter = graph.add("palettegen")
video_out = graph.add("buffersink")
video_in.link_to(palette_gen_filter)
palette_gen_filter.link_to(video_out)
graph.configure()
for frame in input_container.decode(video=0):
graph.vpush(frame)
graph.vpush(None)
# if we do not push None, we get a BlockingIOError
palette_frame = graph.vpull()
assert isinstance(palette_frame, av.VideoFrame)
assert palette_frame.width == 16
assert palette_frame.height == 16
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