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import fractions
import sys
from aiortc.codecs import PCMA_CODEC, PCMU_CODEC, get_decoder, get_encoder
from aiortc.codecs.g711 import PcmaDecoder, PcmaEncoder, PcmuDecoder, PcmuEncoder
from aiortc.jitterbuffer import JitterFrame
from .codecs import CodecTestCase
# silence
PCMA_PAYLOAD = b"\xd5" * 160
PCMU_PAYLOAD = b"\xff" * 160
class PcmaTest(CodecTestCase):
def test_decoder(self):
decoder = get_decoder(PCMA_CODEC)
self.assertIsInstance(decoder, PcmaDecoder)
frames = decoder.decode(JitterFrame(data=PCMA_PAYLOAD, timestamp=0))
self.assertEqual(len(frames), 1)
frame = frames[0]
self.assertEqual(frame.format.name, "s16")
self.assertEqual(frame.layout.name, "mono")
self.assertEqual(
bytes(frame.planes[0]),
(b"\x08\x00" if sys.byteorder == "little" else b"\x00\x08") * 160,
)
self.assertEqual(frame.pts, 0)
self.assertEqual(frame.samples, 160)
self.assertEqual(frame.sample_rate, 8000)
self.assertEqual(frame.time_base, fractions.Fraction(1, 8000))
def test_encoder_mono_8hz(self):
encoder = get_encoder(PCMA_CODEC)
self.assertIsInstance(encoder, PcmaEncoder)
for frame in self.create_audio_frames(
layout="mono", sample_rate=8000, count=10
):
payloads, timestamp = encoder.encode(frame)
self.assertEqual(payloads, [PCMA_PAYLOAD])
self.assertEqual(timestamp, frame.pts)
def test_encoder_stereo_8khz(self):
encoder = get_encoder(PCMA_CODEC)
self.assertIsInstance(encoder, PcmaEncoder)
for frame in self.create_audio_frames(
layout="stereo", sample_rate=8000, count=10
):
payloads, timestamp = encoder.encode(frame)
self.assertEqual(payloads, [PCMA_PAYLOAD])
self.assertEqual(timestamp, frame.pts)
def test_encoder_stereo_48khz(self):
encoder = get_encoder(PCMA_CODEC)
self.assertIsInstance(encoder, PcmaEncoder)
output = [
encoder.encode(frame)
for frame in self.create_audio_frames(
layout="stereo", sample_rate=48000, count=10
)
]
self.assertEqual(
output,
[
([], None), # No output due to buffering.
([PCMA_PAYLOAD], 0),
([PCMA_PAYLOAD], 160),
([PCMA_PAYLOAD], 320),
([PCMA_PAYLOAD], 480),
([PCMA_PAYLOAD], 640),
([PCMA_PAYLOAD], 800),
([PCMA_PAYLOAD], 960),
([PCMA_PAYLOAD], 1120),
([PCMA_PAYLOAD], 1280),
],
)
def test_encoder_pack(self):
encoder = get_encoder(PCMA_CODEC)
self.assertTrue(isinstance(encoder, PcmaEncoder))
packet = self.create_packet(payload=PCMA_PAYLOAD, pts=1)
payloads, timestamp = encoder.pack(packet)
self.assertEqual(payloads, [PCMA_PAYLOAD])
self.assertEqual(timestamp, 8)
def test_roundtrip(self):
self.roundtrip_audio(PCMA_CODEC, output_layout="mono", output_sample_rate=8000)
def test_roundtrip_with_loss(self):
self.roundtrip_audio(
PCMA_CODEC, output_layout="mono", output_sample_rate=8000, drop=[1]
)
class PcmuTest(CodecTestCase):
def test_decoder(self):
decoder = get_decoder(PCMU_CODEC)
self.assertIsInstance(decoder, PcmuDecoder)
frames = decoder.decode(JitterFrame(data=PCMU_PAYLOAD, timestamp=0))
self.assertEqual(len(frames), 1)
frame = frames[0]
self.assertEqual(frame.format.name, "s16")
self.assertEqual(frame.layout.name, "mono")
self.assertEqual(bytes(frame.planes[0]), b"\x00\x00" * 160)
self.assertEqual(frame.pts, 0)
self.assertEqual(frame.samples, 160)
self.assertEqual(frame.sample_rate, 8000)
self.assertEqual(frame.time_base, fractions.Fraction(1, 8000))
def test_encoder_mono_8hz(self):
encoder = get_encoder(PCMU_CODEC)
self.assertIsInstance(encoder, PcmuEncoder)
for frame in self.create_audio_frames(
layout="mono", sample_rate=8000, count=10
):
payloads, timestamp = encoder.encode(frame)
self.assertEqual(payloads, [PCMU_PAYLOAD])
self.assertEqual(timestamp, frame.pts)
def test_encoder_stereo_8khz(self):
encoder = get_encoder(PCMU_CODEC)
self.assertIsInstance(encoder, PcmuEncoder)
for frame in self.create_audio_frames(
layout="stereo", sample_rate=8000, count=10
):
payloads, timestamp = encoder.encode(frame)
self.assertEqual(payloads, [PCMU_PAYLOAD])
self.assertEqual(timestamp, frame.pts)
def test_encoder_stereo_48khz(self):
encoder = get_encoder(PCMU_CODEC)
self.assertIsInstance(encoder, PcmuEncoder)
output = [
encoder.encode(frame)
for frame in self.create_audio_frames(
layout="stereo", sample_rate=48000, count=10
)
]
self.assertEqual(
output,
[
([], None), # No output due to buffering
([PCMU_PAYLOAD], 0),
([PCMU_PAYLOAD], 160),
([PCMU_PAYLOAD], 320),
([PCMU_PAYLOAD], 480),
([PCMU_PAYLOAD], 640),
([PCMU_PAYLOAD], 800),
([PCMU_PAYLOAD], 960),
([PCMU_PAYLOAD], 1120),
([PCMU_PAYLOAD], 1280),
],
)
def test_roundtrip(self):
self.roundtrip_audio(PCMU_CODEC, output_layout="mono", output_sample_rate=8000)
def test_roundtrip_with_loss(self):
self.roundtrip_audio(
PCMU_CODEC, output_layout="mono", output_sample_rate=8000, drop=[1]
)
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