Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/selkies/webrtc/codecs/g722.py: 80%

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33 

34import fractions 

35from ..mediastreams import convert_timebase 

36from .base import Decoder, Encoder, EncodedPacket 

37 

38SAMPLE_RATE = 16000 

39SAMPLE_WIDTH = 2 

40SAMPLES_PER_FRAME = 320 

41TIME_BASE = fractions.Fraction(1, 16000) 

42 

43# Even though the sample rate is 16kHz, the clockrate is defined as 8kHz. 

44# This is why we have multiplications and divisions by 2 in the code. 

45CLOCK_BASE = fractions.Fraction(1, 8000) 

46 

47 

48class G722Decoder(Decoder): 

49 pass 

50 

51 

52class G722Encoder(Encoder): 

53 def pack(self, packet: EncodedPacket) -> tuple[list[bytes], int, bool]: 

54 timestamp = convert_timebase(packet.pts, packet.time_base, CLOCK_BASE) 

55 return [bytes(packet.data)], timestamp, False