RtpTransceiverExt.kt
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/*
* Copyright 2023-2024 LiveKit, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.livekit.android.webrtc
import io.livekit.android.dagger.CapabilitiesGetter
import io.livekit.android.util.LKLog
import livekit.org.webrtc.MediaStreamTrack
import livekit.org.webrtc.RtpCapabilities
import livekit.org.webrtc.RtpTransceiver
internal fun RtpTransceiver.sortVideoCodecPreferences(targetCodec: String, capabilitiesGetter: CapabilitiesGetter) {
val capabilities = capabilitiesGetter(MediaStreamTrack.MediaType.MEDIA_TYPE_VIDEO)
LKLog.v { "capabilities:" }
capabilities.codecs.forEach { codec ->
LKLog.v { "codec: ${codec.name}, ${codec.kind}, ${codec.mimeType}, ${codec.parameters}, ${codec.preferredPayloadType}" }
}
val matched = mutableListOf<RtpCapabilities.CodecCapability>()
val partialMatched = mutableListOf<RtpCapabilities.CodecCapability>()
val unmatched = mutableListOf<RtpCapabilities.CodecCapability>()
for (codec in capabilities.codecs) {
val mimeType = codec.mimeType.lowercase()
if (mimeType == "audio/opus") {
matched.add(codec)
continue
}
if (mimeType != "video/$targetCodec") {
unmatched.add(codec)
continue
}
// for h264 codecs that have sdpFmtpLine available, use only if the
// profile-level-id is 42e01f for cross-browser compatibility
if (targetCodec == "h264") {
if (codec.parameters["profile-level-id"] == "42e01f") {
matched.add(codec)
} else {
partialMatched.add(codec)
}
continue
} else {
matched.add(codec)
}
}
setCodecPreferences(matched.plus(partialMatched).plus(unmatched))
}