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import fractions
from unittest import TestCase
from aiortc.codecs import depayload, get_decoder, get_encoder
from aiortc.jitterbuffer import JitterFrame
from aiortc.mediastreams import AUDIO_PTIME, VIDEO_TIME_BASE
from av import AudioFrame, VideoFrame
from av.packet import Packet
class CodecTestCase(TestCase):
def create_audio_frame(self, samples, pts, layout="mono", sample_rate=48000):
frame = AudioFrame(format="s16", layout=layout, samples=samples)
for p in frame.planes:
p.update(bytes(p.buffer_size))
frame.pts = pts
frame.sample_rate = sample_rate
frame.time_base = fractions.Fraction(1, sample_rate)
return frame
def create_audio_frames(self, layout, sample_rate, count):
frames = []
timestamp = 0
samples_per_frame = int(AUDIO_PTIME * sample_rate)
for i in range(count):
frames.append(
self.create_audio_frame(
samples=samples_per_frame,
pts=timestamp,
layout=layout,
sample_rate=sample_rate,
)
)
timestamp += samples_per_frame
return frames
def create_packet(self, payload: bytes, pts: int) -> Packet:
"""
Create a packet.
"""
packet = Packet(len(payload))
packet.update(payload)
packet.pts = pts
packet.time_base = fractions.Fraction(1, 1000)
return packet
def create_video_frame(
self, width, height, pts, format="yuv420p", time_base=VIDEO_TIME_BASE
):
"""
Create a single blank video frame.
"""
frame = VideoFrame(width=width, height=height, format=format)
for p in frame.planes:
p.update(bytes(p.buffer_size))
frame.pts = pts
frame.time_base = time_base
return frame
def create_video_frames(self, width, height, count, time_base=VIDEO_TIME_BASE):
"""
Create consecutive blank video frames.
"""
frames = []
for i in range(count):
frames.append(
self.create_video_frame(
width=width,
height=height,
pts=int(i / time_base / 30),
time_base=time_base,
)
)
return frames
def roundtrip_audio(
self,
codec,
output_layout,
output_sample_rate,
input_layout="mono",
input_sample_rate=8000,
drop=[],
):
"""
Round-trip an AudioFrame through encoder then decoder.
"""
encoder = get_encoder(codec)
decoder = get_decoder(codec)
input_frames = self.create_audio_frames(
layout=input_layout, sample_rate=input_sample_rate, count=10
)
output_sample_count = int(output_sample_rate * AUDIO_PTIME)
for i, frame in enumerate(input_frames):
# encode
packages, timestamp = encoder.encode(frame)
if i not in drop:
# depacketize
data = b""
for package in packages:
data += depayload(codec, package)
# decode
frames = decoder.decode(JitterFrame(data=data, timestamp=timestamp))
self.assertEqual(len(frames), 1)
self.assertEqual(frames[0].format.name, "s16")
self.assertEqual(frames[0].layout.name, output_layout)
self.assertEqual(frames[0].samples, output_sample_rate * AUDIO_PTIME)
self.assertEqual(frames[0].sample_rate, output_sample_rate)
self.assertEqual(frames[0].pts, i * output_sample_count)
self.assertEqual(
frames[0].time_base, fractions.Fraction(1, output_sample_rate)
)
def roundtrip_video(self, codec, width, height, time_base=VIDEO_TIME_BASE):
"""
Round-trip a VideoFrame through encoder then decoder.
"""
encoder = get_encoder(codec)
decoder = get_decoder(codec)
input_frames = self.create_video_frames(
width=width, height=height, count=30, time_base=time_base
)
for i, frame in enumerate(input_frames):
# encode
packages, timestamp = encoder.encode(frame)
# depacketize
data = b""
for package in packages:
data += depayload(codec, package)
# decode
frames = decoder.decode(JitterFrame(data=data, timestamp=timestamp))
self.assertEqual(len(frames), 1)
self.assertEqual(frames[0].width, frame.width)
self.assertEqual(frames[0].height, frame.height)
self.assertEqual(frames[0].pts, i * 3000)
self.assertEqual(frames[0].time_base, VIDEO_TIME_BASE)
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