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from aiortc.codecs import get_decoder, get_encoder
from aiortc.codecs.opus import OpusDecoder, OpusEncoder
from aiortc.jitterbuffer import JitterFrame
from aiortc.rtcrtpparameters import RTCRtpCodecParameters
from .codecs import CodecTestCase
OPUS_CODEC = RTCRtpCodecParameters(
mimeType="audio/opus", clockRate=48000, channels=2, payloadType=100
)
OPUS_PAYLOAD = b"\xfc\xff\xfe"
class OpusTest(CodecTestCase):
def test_decoder(self) -> None:
decoder = get_decoder(OPUS_CODEC)
self.assertIsInstance(decoder, OpusDecoder)
frames = decoder.decode(JitterFrame(data=OPUS_PAYLOAD, timestamp=0))
self.assertEqual(len(frames), 1)
frame = frames[0]
self.assertAudioFrame(
frame,
data=b"\x00" * 4 * 960,
layout="stereo",
pts=0,
samples=960,
sample_rate=48000,
)
def test_encoder_mono_8khz(self) -> None:
encoder = get_encoder(OPUS_CODEC)
self.assertIsInstance(encoder, OpusEncoder)
output = [
encoder.encode(frame)
for frame in self.create_audio_frames(
layout="mono", sample_rate=8000, count=3
)
]
self.assertEqual(
output,
[
([], None), # No output due to buffering.
([OPUS_PAYLOAD], 0),
([OPUS_PAYLOAD], 960),
],
)
def test_encoder_stereo_8khz(self) -> None:
encoder = get_encoder(OPUS_CODEC)
self.assertIsInstance(encoder, OpusEncoder)
output = [
encoder.encode(frame)
for frame in self.create_audio_frames(
layout="stereo", sample_rate=8000, count=3
)
]
self.assertEqual(
output,
[
([], None), # No output due to buffering.
([OPUS_PAYLOAD], 0),
([OPUS_PAYLOAD], 960),
],
)
def test_encoder_stereo_48khz(self) -> None:
encoder = get_encoder(OPUS_CODEC)
self.assertIsInstance(encoder, OpusEncoder)
frames = self.create_audio_frames(layout="stereo", sample_rate=48000, count=2)
# first frame
payloads, timestamp = encoder.encode(frames[0])
self.assertEqual(payloads, [OPUS_PAYLOAD])
self.assertEqual(timestamp, 0)
# second frame
payloads, timestamp = encoder.encode(frames[1])
self.assertEqual(timestamp, 960)
def test_encoder_pack(self) -> None:
encoder = get_encoder(OPUS_CODEC)
self.assertTrue(isinstance(encoder, OpusEncoder))
packet = self.create_packet(payload=OPUS_PAYLOAD, pts=1)
payloads, timestamp = encoder.pack(packet)
self.assertEqual(payloads, [OPUS_PAYLOAD])
self.assertEqual(timestamp, 48)
def test_roundtrip(self) -> None:
self.roundtrip_audio(OPUS_CODEC, layout="stereo", sample_rate=48000)
def test_roundtrip_with_loss(self) -> None:
self.roundtrip_audio(OPUS_CODEC, layout="stereo", sample_rate=48000, drop=[1])
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