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Add Opus payloader #47

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Merged
merged 2 commits into from
Dec 22, 2023
Merged

Add Opus payloader #47

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4d58fff
Add the most basci Opus payloader
LVala Dec 21, 2023
6a1ff99
Fix typo
LVala Dec 22, 2023
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4 changes: 3 additions & 1 deletion examples/send_from_file/example.exs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ defmodule Peer do
PeerConnection,
RTPCodecParameters,
RTP.VP8Payloader,
RTP.OpusPayloader,
RTPTransceiver,
SessionDescription
}
Expand Down Expand Up @@ -159,7 +160,8 @@ defmodule Peer do
# that's why you might hear short pauses in audio playback, when using this example
Process.send_after(self(), :send_audio_packet, duration)
# values set to 0 are handled by PeerConnection.set_rtp
rtp_packet = ExRTP.Packet.new(packet, 0, 0, state.last_audio_timestamp, 0)
rtp_packet = OpusPayloader.payload(packet)
rtp_packet = %{rtp_packet | timestamp: state.last_audio_timestamp}
PeerConnection.send_rtp(state.peer_connection, state.audio_track_id, rtp_packet)

# OggReader.next_packet/1 returns duration in ms
Expand Down
15 changes: 15 additions & 0 deletions lib/ex_webrtc/rtp/opus_payloader.ex
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
defmodule ExWebRTC.RTP.OpusPayloader do
@moduledoc """
Encapsulates Opus audio packet into an RTP packet.
"""

@doc """
Packs Opus packet into an RTP packet.

Fields from RTP header like ssrc, timestamp etc. are set to 0.
"""
@spec payload(binary()) :: ExRTP.Packet.t()
def payload(packet) when packet != <<>> do
ExRTP.Packet.new(packet, 0, 0, 0, 0)
end
end