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import fractions
import io
from contextlib import redirect_stderr
from unittest import TestCase
from aiortc.codecs import get_decoder, get_encoder
from aiortc.codecs.h264 import H264Decoder, H264Encoder, H264PayloadDescriptor
from aiortc.jitterbuffer import JitterFrame
from aiortc.rtcrtpparameters import RTCRtpCodecParameters
from av import Packet
from .codecs import CodecTestCase
from .utils import load
H264_CODEC = RTCRtpCodecParameters(
mimeType="video/H264", clockRate=90000, payloadType=100
)
class FragmentedCodecContext:
def __init__(self, orig):
self.__orig = orig
def encode(self, frame):
packages = self.__orig.encode(frame)
dummy = Packet()
dummy.pts = packages[0].pts
packages.append(dummy)
return packages
def __getattr__(self, name):
return getattr(self.__orig, name)
class H264PayloadDescriptorTest(TestCase):
def test_parse_empty(self):
with self.assertRaises(ValueError) as cm:
H264PayloadDescriptor.parse(b"")
self.assertEqual(str(cm.exception), "NAL unit is too short")
def test_parse_stap_a(self):
payload = load("h264_0000.bin")
descr, rest = H264PayloadDescriptor.parse(payload)
self.assertEqual(descr.first_fragment, True)
self.assertEqual(repr(descr), "H264PayloadDescriptor(FF=True)")
self.assertEqual(rest[:4], b"\00\00\00\01")
self.assertEqual(len(rest), 26)
def test_parse_stap_a_truncated(self):
payload = load("h264_0000.bin")
with self.assertRaises(ValueError) as cm:
H264PayloadDescriptor.parse(payload[0:1])
self.assertEqual(str(cm.exception), "NAL unit is too short")
with self.assertRaises(ValueError) as cm:
H264PayloadDescriptor.parse(payload[0:2])
self.assertEqual(str(cm.exception), "STAP-A length field is truncated")
with self.assertRaises(ValueError) as cm:
H264PayloadDescriptor.parse(payload[0:3])
self.assertEqual(str(cm.exception), "STAP-A data is truncated")
def test_parse_stap_b(self):
with self.assertRaises(ValueError) as cm:
H264PayloadDescriptor.parse(b"\x19\x00")
self.assertEqual(str(cm.exception), "NAL unit type 25 is not supported")
def test_parse_fu_a_1(self):
payload = load("h264_0001.bin")
descr, rest = H264PayloadDescriptor.parse(payload)
self.assertEqual(descr.first_fragment, True)
self.assertEqual(repr(descr), "H264PayloadDescriptor(FF=True)")
self.assertEqual(rest[:4], b"\00\00\00\01")
self.assertEqual(len(rest), 916)
def test_parse_fu_a_2(self):
payload = load("h264_0002.bin")
descr, rest = H264PayloadDescriptor.parse(payload)
self.assertEqual(descr.first_fragment, False)
self.assertEqual(repr(descr), "H264PayloadDescriptor(FF=False)")
self.assertNotEqual(rest[:4], b"\00\00\00\01")
self.assertEqual(len(rest), 912)
def test_parse_fu_a_truncated(self):
with self.assertRaises(ValueError) as cm:
H264PayloadDescriptor.parse(b"\x7c")
self.assertEqual(str(cm.exception), "NAL unit is too short")
def test_parse_nalu(self):
payload = load("h264_0003.bin")
descr, rest = H264PayloadDescriptor.parse(payload)
self.assertEqual(descr.first_fragment, True)
self.assertEqual(repr(descr), "H264PayloadDescriptor(FF=True)")
self.assertEqual(rest[:4], b"\00\00\00\01")
self.assertEqual(rest[4:], payload)
self.assertEqual(len(rest), 564)
class H264Test(CodecTestCase):
def test_decoder(self):
decoder = get_decoder(H264_CODEC)
self.assertIsInstance(decoder, H264Decoder)
# decode junk
with redirect_stderr(io.StringIO()):
frames = decoder.decode(JitterFrame(data=b"123", timestamp=0))
self.assertEqual(frames, [])
def test_encoder(self):
encoder = get_encoder(H264_CODEC)
self.assertIsInstance(encoder, H264Encoder)
frame = self.create_video_frame(width=640, height=480, pts=0)
packages, timestamp = encoder.encode(frame)
self.assertGreaterEqual(len(packages), 1)
self.assertEqual(timestamp, 0)
def test_encoder_large(self):
encoder = get_encoder(H264_CODEC)
self.assertIsInstance(encoder, H264Encoder)
# first keyframe
frame = self.create_video_frame(width=1280, height=720, pts=0)
payloads, timestamp = encoder.encode(frame)
self.assertGreaterEqual(len(payloads), 3)
self.assertEqual(timestamp, 0)
# delta frame
frame = self.create_video_frame(width=1280, height=720, pts=3000)
payloads, timestamp = encoder.encode(frame)
self.assertGreaterEqual(len(payloads), 1)
self.assertEqual(timestamp, 3000)
# force keyframe
frame = self.create_video_frame(width=1280, height=720, pts=6000)
payloads, timestamp = encoder.encode(frame, force_keyframe=True)
self.assertGreaterEqual(len(payloads), 3)
self.assertEqual(timestamp, 6000)
def test_encoder_pack(self):
encoder = get_encoder(H264_CODEC)
self.assertTrue(isinstance(encoder, H264Encoder))
packet = self.create_packet(payload=bytes([0, 0, 1, 0]), pts=1)
payloads, timestamp = encoder.pack(packet)
self.assertEqual(payloads, [b"\x00"])
self.assertEqual(timestamp, 90)
def test_encoder_target_bitrate(self):
encoder = get_encoder(H264_CODEC)
self.assertIsInstance(encoder, H264Encoder)
self.assertEqual(encoder.target_bitrate, 1000000)
frame = self.create_video_frame(width=640, height=480, pts=0)
packages, timestamp = encoder.encode(frame)
self.assertGreaterEqual(len(packages), 1)
self.assertTrue(len(packages[0]) < 1300)
self.assertEqual(timestamp, 0)
# change target bitrate
encoder.target_bitrate = 1200000
self.assertEqual(encoder.target_bitrate, 1200000)
frame = self.create_video_frame(width=640, height=480, pts=3000)
packages, timestamp = encoder.encode(frame)
self.assertGreaterEqual(len(packages), 1)
self.assertTrue(len(packages[0]) < 1300)
self.assertEqual(timestamp, 3000)
def test_roundtrip_1280_720(self):
self.roundtrip_video(H264_CODEC, 1280, 720)
def test_roundtrip_960_540(self):
self.roundtrip_video(H264_CODEC, 960, 540)
def test_roundtrip_640_480(self):
self.roundtrip_video(H264_CODEC, 640, 480)
def test_roundtrip_640_480_time_base(self):
self.roundtrip_video(
H264_CODEC, 640, 480, time_base=fractions.Fraction(1, 9000)
)
def test_roundtrip_320_240(self):
self.roundtrip_video(H264_CODEC, 320, 240)
def test_split_bitstream(self):
# No start code
packages = list(H264Encoder._split_bitstream(b"\x00\x00\x00\x00"))
self.assertEqual(packages, [])
# 3-byte start code
packages = list(
H264Encoder._split_bitstream(b"\x00\x00\x01\xff\x00\x00\x01\xfb")
)
self.assertEqual(packages, [b"\xff", b"\xfb"])
# 4-byte start code
packages = list(
H264Encoder._split_bitstream(b"\x00\x00\x00\x01\xff\x00\x00\x00\x01\xfb")
)
self.assertEqual(packages, [b"\xff", b"\xfb"])
# Multiple bytes in a packet
packages = list(
H264Encoder._split_bitstream(
b"\x00\x00\x00\x01\xff\xab\xcd\x00\x00\x00\x01\xfb"
)
)
self.assertEqual(packages, [b"\xff\xab\xcd", b"\xfb"])
# Skip leading 0s
packages = list(H264Encoder._split_bitstream(b"\x00\x00\x00\x01\xff"))
self.assertEqual(packages, [b"\xff"])
# Both leading and trailing 0s
packages = list(
H264Encoder._split_bitstream(
b"\x00\x00\x00\x00\x00\x00\x01\xff\x00\x00\x00\x00\x00"
)
)
self.assertEqual(packages, [b"\xff\x00\x00\x00\x00\x00"])
def test_packetize_one_small(self):
packages = [bytes([0xFF, 0xFF])]
packetize_packages = H264Encoder._packetize(packages)
self.assertListEqual(packages, packetize_packages)
packages = [bytes([0xFF]) * 1300]
packetize_packages = H264Encoder._packetize(packages)
self.assertListEqual(packages, packetize_packages)
def test_packetize_one_big(self):
packages = [bytes([0xFF, 0xFF] * 1000)]
packetize_packages = H264Encoder._packetize(packages)
self.assertEqual(len(packetize_packages), 2)
self.assertEqual(packetize_packages[0][0] & 0x1F, 28)
self.assertEqual(packetize_packages[1][0] & 0x1F, 28)
def test_packetize_two_small(self):
packages = [bytes([0x01, 0xFF]), bytes([0xFF, 0xFF])]
packetize_packages = H264Encoder._packetize(packages)
self.assertEqual(len(packetize_packages), 1)
self.assertEqual(packetize_packages[0][0] & 0x1F, 24)
def test_packetize_multiple_small(self):
packages = [bytes([0x01, 0xFF])] * 9
packetize_packages = H264Encoder._packetize(packages)
self.assertEqual(len(packetize_packages), 1)
self.assertEqual(packetize_packages[0][0] & 0x1F, 24)
packages = [bytes([0x01, 0xFF])] * 10
packetize_packages = H264Encoder._packetize(packages)
self.assertEqual(len(packetize_packages), 2)
self.assertEqual(packetize_packages[0][0] & 0x1F, 24)
self.assertEqual(packetize_packages[1], packages[-1])
def test_frame_encoder(self):
encoder = get_encoder(H264_CODEC)
frame = self.create_video_frame(width=640, height=480, pts=0)
packages = list(encoder._encode_frame(frame, False))
self.assertGreaterEqual(len(packages), 3)
# first frame must have at least
set(p[0] & 0x1F for p in packages).issuperset(
{
8, # PPS (picture parameter set)
7, # SPS (session parameter set)
5, # IDR (aka key frame)
}
)
frame = self.create_video_frame(width=640, height=480, pts=3000)
packages = list(encoder._encode_frame(frame, False))
self.assertGreaterEqual(len(packages), 1)
# change resolution
frame = self.create_video_frame(width=320, height=240, pts=6000)
packages = list(encoder._encode_frame(frame, False))
self.assertGreaterEqual(len(packages), 1)
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